自动布局警告：将尝试通过在 CollectionView 中打破约束 <NSLayoutConstraint 来恢复
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【中文标题】自动布局警告：将尝试通过在 CollectionView 中打破约束 <NSLayoutConstraint 来恢复【英文标题】：Autolayout Warning : Will attempt to recover by breaking constraint <NSLayoutConstraint in CollectionView 【发布时间】：2017-06-06 16:54:40 【问题描述】：我使用 UICollectionView & Flow Layout 和 Class 来布局 collectionView Cell 是为了实现像 feedly app 或 insorts app 这样的幻灯片动画
import UIKit
class UltravisualLayout: UICollectionViewLayout
fileprivate var contentWidth:CGFloat!
fileprivate var contentHeight:CGFloat!
fileprivate var yOffset:CGFloat = 0
var maxAlpha:CGFloat = 1
var minAlpha:CGFloat = 0
var widthOffset:CGFloat = 0
var heightOffset:CGFloat = 0
fileprivate var cache = [UICollectionViewLayoutAttributes]()
fileprivate var itemWidth:CGFloat
return (collectionView?.bounds.width)!
fileprivate var itemHeight:CGFloat
return (collectionView?.bounds.height)!
fileprivate var collectionViewHeight:CGFloat
return (collectionView?.bounds.height)!
fileprivate var numberOfItems:Int
return (collectionView?.numberOfItems(inSection: 0))!
fileprivate var dragOffset:CGFloat
return (collectionView?.bounds.height)!
fileprivate var currentItemIndex:Int
return max(0, Int(collectionView!.contentOffset.y / collectionViewHeight))
var nextItemBecomeCurrentPercentage:CGFloat
return (collectionView!.contentOffset.y / (collectionViewHeight)) - CGFloat(currentItemIndex)
override func prepare()
cache.removeAll(keepingCapacity: false)
yOffset = 0
for item in 0 ..< numberOfItems
let indexPath = IndexPath(item: item, section: 0)
let attribute = UICollectionViewLayoutAttributes(forCellWith: indexPath)
attribute.zIndex = -(indexPath as NSIndexPath).row
if ((indexPath as NSIndexPath).item == currentItemIndex+1) && ((indexPath as NSIndexPath).item < numberOfItems)
attribute.alpha = minAlpha + max((maxAlpha-minAlpha) * nextItemBecomeCurrentPercentage, 0)
let width = itemWidth - widthOffset + (widthOffset * nextItemBecomeCurrentPercentage)
let height = itemHeight - heightOffset + (heightOffset * nextItemBecomeCurrentPercentage)
let deltaWidth = width/itemWidth
let deltaHeight = height/itemHeight
attribute.frame = CGRect(x: 0, y: yOffset, width: itemWidth, height: itemHeight)
attribute.transform = CGAffineTransform(scaleX: deltaWidth, y: deltaHeight)
attribute.center.y = (collectionView?.center.y)! + (collectionView?.contentOffset.y)!
attribute.center.x = (collectionView?.center.x)! + (collectionView?.contentOffset.x)!
yOffset += collectionViewHeight
else
attribute.frame = CGRect(x: 0, y: yOffset, width: itemWidth, height: itemHeight)
attribute.center.y = (collectionView?.center.y)! + yOffset
attribute.center.x = (collectionView?.center.x)!
yOffset += collectionViewHeight
cache.append(attribute)
//Return the size of ContentView
override var collectionViewContentSize : CGSize
contentWidth = (collectionView?.bounds.width)!
contentHeight = CGFloat(numberOfItems) * (collectionView?.bounds.height)!
return CGSize(width: contentWidth, height: contentHeight)
//Return Attributes whose frame lies in the Visible Rect
override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]?
var layoutAttributes = [UICollectionViewLayoutAttributes]()
for attribute in cache
if attribute.frame.intersects(rect)
layoutAttributes.append(attribute)
return layoutAttributes
override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool
return true
override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint
let itemIndex = round(proposedContentOffset.y / (dragOffset))
let yOffset = itemIndex * (collectionView?.bounds.height)!
return CGPoint(x: 0, y: yOffset)
override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes?
// Logic that calculates the UICollectionViewLayoutAttributes of the item
// and returns the UICollectionViewLayoutAttributes
return UICollectionViewLayoutAttributes(forCellWith: indexPath)
我使用 Xib 创建了自定义视图
课堂小故事
#import <UIKit/UIKit.h>
@interface SmallStory : UIView
@property (weak, nonatomic) IBOutlet UIImageView *image;
@property (weak, nonatomic) IBOutlet UILabel *title;
@property (weak, nonatomic) IBOutlet UILabel *pubDate;
@end
SmallStory.m
#import "SmallStory.h"
@interface SmallStory()
@property (nonatomic, strong) UIView *containerView;
@property (nonatomic, strong) NSMutableArray *customConstraints;
@end
@implementation SmallStory
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
// Drawing code
*/
- (instancetype)initWithCoder:(NSCoder *)aDecoder
self = [super initWithCoder:aDecoder];
if (self)
[self customInit];
return self;
- (instancetype)initWithFrame:(CGRect)frame
self = [super initWithFrame:frame];
if (self)
[self customInit];
return self;
- (void)customInit
_customConstraints = [[NSMutableArray alloc] init];
UIView *view = nil;
NSArray *objects = [[NSBundle mainBundle] loadNibNamed:@"SmallStory"
owner:self
options:nil];
for (id object in objects)
if ([object isKindOfClass:[UIView class]])
view = object;
break;
if (view != nil)
_containerView = view;
view.translatesAutoresizingMaskIntoConstraints = NO;
[self addSubview:view];
[self setNeedsUpdateConstraints];
- (void)updateConstraints
[self removeConstraints:self.customConstraints];
[self.customConstraints removeAllObjects];
if (self.containerView != nil)
UIView *view = self.containerView;
NSDictionary *views = NSDictionaryOfVariableBindings(view);
[self.customConstraints addObjectsFromArray:
[NSLayoutConstraint constraintsWithVisualFormat:
@"H:|[view]|" options:0 metrics:nil views:views]];
[self.customConstraints addObjectsFromArray:
[NSLayoutConstraint constraintsWithVisualFormat:
@"V:|[view]|" options:0 metrics:nil views:views]];
[self addConstraints:self.customConstraints];
[super updateConstraints];
- (UIViewController*)getSuperViewController
for (UIView* next = [self superview]; next; next = next.superview)
UIResponder* nextResponder = [next nextResponder];
if ([nextResponder isKindOfClass:[UIViewController class]])
return (UIViewController*)nextResponder;
return nil;
@end
Xib 设计的样子
id 分为 5 个部分
每个小视图都被分配为 SmallStory 类
故事板看起来像
当我运行 App 时出现如下自动布局警告
*2017-06-06 22:18:04.044717+0530 Jansatta[1096:258239] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x17028ca30 h=--& v=--& UIView:0x113d2c230.height == 0 (active)>",
"<NSLayoutConstraint:0x1702875d0 UIImageView:0x113e32700.bottom == UIView:0x113e32e10.bottomMargin (active)>",
"<NSLayoutConstraint:0x170287260 UIImageView:0x113e32700.top == UIView:0x113e32e10.topMargin (active)>",
"<NSLayoutConstraint:0x17028af00 SmallStory:0x113e324f0.height == SmallStory:0x113d2c5e0.height (active)>",
"<NSLayoutConstraint:0x17028aff0 SmallStory:0x113d2c5e0.height == SmallStory:0x113d2c3d0.height (active)>",
"<NSLayoutConstraint:0x17028b270 SmallStory:0x113d2c3d0.height == 0.2*UIView:0x113d2c230.height (active)>",
"<NSLayoutConstraint:0x17028bea0 V:|-(0)-[UIView:0x113e32e10] (active, names: '|':SmallStory:0x113e324f0 )>",
"<NSLayoutConstraint:0x17028bef0 V:[UIView:0x113e32e10]-(0)-| (active, names: '|':SmallStory:0x113e324f0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1702875d0 UIImageView:0x113e32700.bottom == UIView:0x113e32e10.bottomMargin (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-06-06 22:18:04.047763+0530 Jansatta[1096:258239] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x17028cad0 h=--& v=--& UIView:0x113d2c230.width == 0 (active)>",
"<NSLayoutConstraint:0x174285f00 H:|-(10)-[UIImageView:0x113d2c980] (active, names: '|':UIView:0x113d2d090 )>",
"<NSLayoutConstraint:0x174285f50 H:[UILabel:0x113d2ce00]-(10)-| (active, names: '|':UIView:0x113d2d090 )>",
"<NSLayoutConstraint:0x174285ff0 H:[UIImageView:0x113d2c980]-(10)-[UILabel:0x113d2ce00] (active)>",
"<NSLayoutConstraint:0x17028b130 SmallStory:0x113d2c3d0.width == UIView:0x113d2c230.width (active)>",
"<NSLayoutConstraint:0x17028b950 H:|-(0)-[UIView:0x113d2d090] (active, names: '|':SmallStory:0x113d2c3d0 )>",
"<NSLayoutConstraint:0x17028b9a0 H:[UIView:0x113d2d090]-(0)-| (active, names: '|':SmallStory:0x113d2c3d0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x174285ff0 H:[UIImageView:0x113d2c980]-(10)-[UILabel:0x113d2ce00] (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-06-06 22:18:04.050793+0530 Jansatta[1096:258239] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x17028ca30 h=--& v=--& UIView:0x113d2c230.height == 0 (active)>",
"<NSLayoutConstraint:0x170288840 UIImageView:0x113e331c0.bottom == UIView:0x113e33e00.bottomMargin (active)>",
"<NSLayoutConstraint:0x1702887a0 UIImageView:0x113e331c0.top == UIView:0x113e33e00.topMargin (active)>",
"<NSLayoutConstraint:0x1702892e0 SmallStory:0x113e32fb0.height == SmallStory:0x113e324f0.height (active)>",
"<NSLayoutConstraint:0x17028af00 SmallStory:0x113e324f0.height == SmallStory:0x113d2c5e0.height (active)>",
"<NSLayoutConstraint:0x17028aff0 SmallStory:0x113d2c5e0.height == SmallStory:0x113d2c3d0.height (active)>",
"<NSLayoutConstraint:0x17028b270 SmallStory:0x113d2c3d0.height == 0.2*UIView:0x113d2c230.height (active)>",
"<NSLayoutConstraint:0x17028c0d0 V:|-(0)-[UIView:0x113e33e00] (active, names: '|':SmallStory:0x113e32fb0 )>",
"<NSLayoutConstraint:0x17028c120 V:[UIView:0x113e33e00]-(0)-| (active, names: '|':SmallStory:0x113e32fb0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x170288840 UIImageView:0x113e331c0.bottom == UIView:0x113e33e00.bottomMargin (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-06-06 22:18:04.054839+0530 Jansatta[1096:258239] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x17028ca30 h=--& v=--& UIView:0x113d2c230.height == 0 (active)>",
"<NSLayoutConstraint:0x170287fd0 UIImageView:0x113e341b0.bottom == UIView:0x113e348c0.bottomMargin (active)>",
"<NSLayoutConstraint:0x170287f30 UIImageView:0x113e341b0.top == UIView:0x113e348c0.topMargin (active)>",
"<NSLayoutConstraint:0x1702892e0 SmallStory:0x113e32fb0.height == SmallStory:0x113e324f0.height (active)>",
"<NSLayoutConstraint:0x1702881b0 SmallStory:0x113e32fb0.height == SmallStory:0x113e33fa0.height (active)>",
"<NSLayoutConstraint:0x17028af00 SmallStory:0x113e324f0.height == SmallStory:0x113d2c5e0.height (active)>",
"<NSLayoutConstraint:0x17028aff0 SmallStory:0x113d2c5e0.height == SmallStory:0x113d2c3d0.height (active)>",
"<NSLayoutConstraint:0x17028b270 SmallStory:0x113d2c3d0.height == 0.2*UIView:0x113d2c230.height (active)>",
"<NSLayoutConstraint:0x17028c300 V:|-(0)-[UIView:0x113e348c0] (active, names: '|':SmallStory:0x113e33fa0 )>",
"<NSLayoutConstraint:0x17028c350 V:[UIView:0x113e348c0]-(0)-| (active, names: '|':SmallStory:0x113e33fa0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x170287fd0 UIImageView:0x113e341b0.bottom == UIView:0x113e348c0.bottomMargin (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-06-06 22:18:04.058339+0530 Jansatta[1096:258239] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x17028cad0 h=--& v=--& UIView:0x113d2c230.width == 0 (active)>",
"<NSLayoutConstraint:0x170287620 H:|-(10)-[UIImageView:0x113e32700] (active, names: '|':UIView:0x113e32e10 )>",
"<NSLayoutConstraint:0x170287670 H:[UILabel:0x113e32b80]-(10)-| (active, names: '|':UIView:0x113e32e10 )>",
"<NSLayoutConstraint:0x1702876c0 H:[UIImageView:0x113e32700]-(10)-[UILabel:0x113e32b80] (active)>",
"<NSLayoutConstraint:0x17028aeb0 SmallStory:0x113e324f0.width == SmallStory:0x113d2c5e0.width (active)>",
"<NSLayoutConstraint:0x17028b040 SmallStory:0x113d2c5e0.width == SmallStory:0x113d2c3d0.width (active)>",
"<NSLayoutConstraint:0x17028b130 SmallStory:0x113d2c3d0.width == UIView:0x113d2c230.width (active)>",
"<NSLayoutConstraint:0x17028be00 H:|-(0)-[UIView:0x113e32e10] (active, names: '|':SmallStory:0x113e324f0 )>",
"<NSLayoutConstraint:0x17028be50 H:[UIView:0x113e32e10]-(0)-| (active, names: '|':SmallStory:0x113e324f0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1702876c0 H:[UIImageView:0x113e32700]-(10)-[UILabel:0x113e32b80] (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-06-06 22:18:04.061159+0530 Jansatta[1096:258239] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x17028cad0 h=--& v=--& UIView:0x113d2c230.width == 0 (active)>",
"<NSLayoutConstraint:0x17028a820 UIImageView:0x113e04f90.width == 180 (active)>",
"<NSLayoutConstraint:0x17028aaf0 H:|-(10)-[UIImageView:0x113e04f90] (active, names: '|':UIView:0x113e195a0 )>",
"<NSLayoutConstraint:0x17028abe0 H:[UILabel:0x113e31dc0]-(10)-| (active, names: '|':UIView:0x113e195a0 )>",
"<NSLayoutConstraint:0x17028ac80 H:[UIImageView:0x113e04f90]-(10)-[UILabel:0x113e31dc0] (active)>",
"<NSLayoutConstraint:0x17028b040 SmallStory:0x113d2c5e0.width == SmallStory:0x113d2c3d0.width (active)>",
"<NSLayoutConstraint:0x17028b130 SmallStory:0x113d2c3d0.width == UIView:0x113d2c230.width (active)>",
"<NSLayoutConstraint:0x17028bbd0 H:|-(0)-[UIView:0x113e195a0] (active, names: '|':SmallStory:0x113d2c5e0 )>",
"<NSLayoutConstraint:0x17028bc20 H:[UIView:0x113e195a0]-(0)-| (active, names: '|':SmallStory:0x113d2c5e0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x17028a820 UIImageView:0x113e04f90.width == 180 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-06-06 22:18:04.064548+0530 Jansatta[1096:258239] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x17028cad0 h=--& v=--& UIView:0x113d2c230.width == 0 (active)>",
"<NSLayoutConstraint:0x17028aaf0 H:|-(10)-[UIImageView:0x113e04f90] (active, names: '|':UIView:0x113e195a0 )>",
"<NSLayoutConstraint:0x17028abe0 H:[UILabel:0x113e31dc0]-(10)-| (active, names: '|':UIView:0x113e195a0 )>",
"<NSLayoutConstraint:0x17028ac80 H:[UIImageView:0x113e04f90]-(10)-[UILabel:0x113e31dc0] (active)>",
"<NSLayoutConstraint:0x17028b040 SmallStory:0x113d2c5e0.width == SmallStory:0x113d2c3d0.width (active)>",
"<NSLayoutConstraint:0x17028b130 SmallStory:0x113d2c3d0.width == UIView:0x113d2c230.width (active)>",
"<NSLayoutConstraint:0x17028bbd0 H:|-(0)-[UIView:0x113e195a0] (active, names: '|':SmallStory:0x113d2c5e0 )>",
"<NSLayoutConstraint:0x17028bc20 H:[UIView:0x113e195a0]-(0)-| (active, names: '|':SmallStory:0x113d2c5e0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x17028ac80 H:[UIImageView:0x113e04f90]-(10)-[UILabel:0x113e31dc0] (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-06-06 22:18:04.066582+0530 Jansatta[1096:258239] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x17028ca30 h=--& v=--& UIView:0x113d2c230.height == 0 (active)>",
"<NSLayoutConstraint:0x17028aaa0 UIImageView:0x113e04f90.bottom == UIView:0x113e195a0.bottomMargin (active)>",
"<NSLayoutConstraint:0x17028ab40 UIImageView:0x113e04f90.top == UIView:0x113e195a0.topMargin (active)>",
"<NSLayoutConstraint:0x17028aff0 SmallStory:0x113d2c5e0.height == SmallStory:0x113d2c3d0.height (active)>",
"<NSLayoutConstraint:0x17028b270 SmallStory:0x113d2c3d0.height == 0.2*UIView:0x113d2c230.height (active)>",
"<NSLayoutConstraint:0x17028bc70 V:|-(0)-[UIView:0x113e195a0] (active, names: '|':SmallStory:0x113d2c5e0 )>",
"<NSLayoutConstraint:0x17028bcc0 V:[UIView:0x113e195a0]-(0)-| (active, names: '|':SmallStory:0x113d2c5e0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x17028aaa0 UIImageView:0x113e04f90.bottom == UIView:0x113e195a0.bottomMargin (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-06-06 22:18:04.068461+0530 Jansatta[1096:258239] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x17028ca30 h=--& v=--& UIView:0x113d2c230.height == 0 (active)>",
"<NSLayoutConstraint:0x174285e60 UIImageView:0x113d2c980.bottom == UIView:0x113d2d090.bottomMargin (active)>",
"<NSLayoutConstraint:0x174285eb0 UIImageView:0x113d2c980.top == UIView:0x113d2d090.topMargin (active)>",
"<NSLayoutConstraint:0x17028b270 SmallStory:0x113d2c3d0.height == 0.2*UIView:0x113d2c230.height (active)>",
"<NSLayoutConstraint:0x17028b9f0 V:|-(0)-[UIView:0x113d2d090] (active, names: '|':SmallStory:0x113d2c3d0 )>",
"<NSLayoutConstraint:0x17028ba40 V:[UIView:0x113d2d090]-(0)-| (active, names: '|':SmallStory:0x113d2c3d0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x174285e60 UIImageView:0x113d2c980.bottom == UIView:0x113d2d090.bottomMargin (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-06-06 22:18:04.070615+0530 Jansatta[1096:258239] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x17028cad0 h=--& v=--& UIView:0x113d2c230.width == 0 (active)>",
"<NSLayoutConstraint:0x1702873f0 UIImageView:0x113e331c0.width == 180 (active)>",
"<NSLayoutConstraint:0x170287760 H:|-(10)-[UIImageView:0x113e331c0] (active, names: '|':UIView:0x113e33e00 )>",
"<NSLayoutConstraint:0x1702886b0 H:[UILabel:0x113e338d0]-(10)-| (active, names: '|':UIView:0x113e33e00 )>",
"<NSLayoutConstraint:0x170288570 H:[UIImageView:0x113e331c0]-(10)-[UILabel:0x113e338d0] (active)>",
"<NSLayoutConstraint:0x1702884d0 UILabel:0x113e338d0.leading == UILabel:0x113e333b0.leading (active)>",
"<NSLayoutConstraint:0x170288390 UILabel:0x113e333b0.trailing == UILabel:0x113e338d0.trailing (active)>",
"<NSLayoutConstraint:0x17028ae60 SmallStory:0x113e32fb0.width == SmallStory:0x113e324f0.width (active)>",
"<NSLayoutConstraint:0x17028aeb0 SmallStory:0x113e324f0.width == SmallStory:0x113d2c5e0.width (active)>",
"<NSLayoutConstraint:0x17028b040 SmallStory:0x113d2c5e0.width == SmallStory:0x113d2c3d0.width (active)>",
"<NSLayoutConstraint:0x17028b130 SmallStory:0x113d2c3d0.width == UIView:0x113d2c230.width (active)>",
"<NSLayoutConstraint:0x17028c030 H:|-(0)-[UIView:0x113e33e00] (active, names: '|':SmallStory:0x113e32fb0 )>",
"<NSLayoutConstraint:0x17028c080 H:[UIView:0x113e33e00]-(0)-| (active, names: '|':SmallStory:0x113e32fb0 )>"
)*
如何解决请帮忙
【问题讨论】：
你为什么使用 5 个视图？ 它需要我们的应用程序，如果任何其他方式那么请建议 您是否尝试过警告提示的内容？ 嘿@vadian 我尝试了很多次为自动布局定义约束但没有成功。 【参考方案1】：嗨，我解决了我的问题，
从必需到高优先级的 Xib 约束警告消失。
【讨论】：
这会消除警告，但不能解决实际问题。【参考方案2】：使用 stackView 而不是 5 个 UIView。
为什么？
StackView 比您现在创建的 UIView 效果更好。
您可以轻松地放入任何视图、隐藏、显示。无需考虑 stackView 中视图之间的自动布局。
我刚刚使用一个 stackView 制作了您所做的。只需查看层次结构
我刚刚在检查器中设置了同样的填充
并且输出没有自动布局问题。只需将左上角右下角约束设置为 0 即可 stackView 的 superView
【讨论】：
对于这五个视图，我有一个自定义的 xib 和 SmallStoryClass 有问题。我也试过这个，但出现警告 嘿@elk_cloner 你是对的，但我有最小的 sdk ios 8 所以目前我不能使用这个功能。以上是关于自动布局警告：将尝试通过在 CollectionView 中打破约束 <NSLayoutConstraint 来恢复的主要内容，如果未能解决你的问题，请参考以下文章