如何列出iOS中uiviewcontroller中的所有子视图?

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【中文标题】如何列出iOS中uiviewcontroller中的所有子视图?【英文标题】:How to list out all the subviews in a uiviewcontroller in iOS? 【发布时间】:2011-08-30 13:25:14 【问题描述】:

我想列出UIViewController 中的所有子视图。我试过self.view.subviews,但并不是所有的子视图都列出来了,比如UITableViewCell中的子视图没有找到。有什么想法吗?

【问题讨论】:

您可以通过递归搜索找到所有子视图。即检查子视图有子视图.. 【参考方案1】:

你必须递归地迭代子视图。

- (void)listSubviewsOfView:(UIView *)view 
    
    // Get the subviews of the view
    NSArray *subviews = [view subviews];

    for (UIView *subview in subviews) 
        
        // Do what you want to do with the subview
        NSLog(@"%@", subview);

        // List the subviews of subview
        [self listSubviewsOfView:subview];
    

【讨论】:

从技术上讲,您不需要检查子视图计数是否为 0。 NSLog(@"\n%@", [(id)self.view performSelector:@selector(recursiveDescription)]);此行打印的结果与您的相同! 如果您在这里,请查看来自@natbro 的更简单的recursiveDescription 答案 - ***.com/a/8962824/429521 这是我的 improvement 到 @EmptyStack 的解决方案。它以递归方式显示类名和框架坐标【参考方案2】:

转储视图层次结构的 xcode/gdb 内置方法很有用 -- recursiveDescription,每 http://developer.apple.com/library/ios/#technotes/tn2239/_index.html

它会输出一个更完整的视图层次结构,您可能会发现它很有用:

> po [_myToolbar recursiveDescription]

<UIToolbarButton: 0xd866040; frame = (152 0; 15 44); opaque = NO; layer = <CALayer: 0xd864230>>
   | <UISwappableImageView: 0xd8660f0; frame = (0 0; 0 0); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0xd86a160>>

【讨论】:

在我的代码或其他地方放置 po [_myToolbar recursiveDescription] 的位置。 @WildPointer 他说的是控制台。您需要在某处设置断点来执行此操作。 po = 打印对象 +1 Apple 推荐这种方法(根据 WWDC 2013 的 Cocoa 和 Cocoa Touch 会议中的隐藏宝石,提示 #5)。 @पवन 见我的回答here。我重写了这个答案。【参考方案3】:

Swift 中优雅的递归解决方案:

extension UIView 

    func subviewsRecursive() -> [UIView] 
        return subviews + subviews.flatMap  $0.subviewsRecursive() 
    


您可以在任何 UIView 上调用 subviewsRecursive():

let allSubviews = self.view.subviewsRecursive()

【讨论】:

【参考方案4】:

你需要递归打印,这个方法也是基于视图深度的标签

-(void) printAllChildrenOfView:(UIView*) node depth:(int) d

    //Tabs are just for formatting
    NSString *tabs = @"";
    for (int i = 0; i < d; i++)
    
        tabs = [tabs stringByAppendingFormat:@"\t"];
    

    NSLog(@"%@%@", tabs, node);

    d++; //Increment the depth
    for (UIView *child in node.subviews)
    
        [self printAllChildrenOfView:child depth:d];
    


【讨论】:

【参考方案5】:

这里是快速版本

 func listSubviewsOfView(view:UIView)

    // Get the subviews of the view
    var subviews = view.subviews

    // Return if there are no subviews
    if subviews.count == 0 
        return
    

    for subview : AnyObject in subviews

        // Do what you want to do with the subview
        println(subview)

        // List the subviews of subview
        listSubviewsOfView(subview as UIView)
    

【讨论】:

【参考方案6】:

我参加聚会有点晚了,但有一个更通用的解决方案:

@implementation UIView (childViews)

- (NSArray*) allSubviews 
    __block NSArray* allSubviews = [NSArray arrayWithObject:self];

    [self.subviews enumerateObjectsUsingBlock:^( UIView* view, NSUInteger idx, BOOL*stop) 
        allSubviews = [allSubviews arrayByAddingObjectsFromArray:[view allSubviews]];
                   ];
        return allSubviews;
    

@end

【讨论】:

【参考方案7】:

详情

Xcode 9.0.1,Swift 4 Xcode 10.2 (10E125)、Swift 5

解决方案

extension UIView 
    private func subviews(parentView: UIView, level: Int = 0, printSubviews: Bool = false) -> [UIView] 
        var result = [UIView]()
        if level == 0 && printSubviews 
            result.append(parentView)
            print("\(parentView.viewInfo)")
        

        for subview in parentView.subviews 
            if printSubviews  print("\(String(repeating: "-", count: level))\(subview.viewInfo)") 
            result.append(subview)
            if subview.subviews.isEmpty  continue 
            result += subviews(parentView: subview, level: level+1, printSubviews: printSubviews)
        
        return result
    
    private var viewInfo: String  return "\(classForCoder), frame: \(frame))" 
    var allSubviews: [UIView]  return subviews(parentView: self) 
    func printSubviews()  _ = subviews(parentView: self, printSubviews: true) 

用法

 view.printSubviews()
 print("\(view.allSubviews.count)")

结果

【讨论】:

这有助于识别麻烦的子视图 - 谢谢【参考方案8】:

如果您想要的只是UIViews 的数组,这是一个单行解决方案(Swift 4+):

extension UIView 
  var allSubviews: [UIView] 
    return self.subviews.reduce([UIView]())  $0 + [$1] + $1.allSubviews 
  

【讨论】:

感谢您的解决方案!我花了几个小时才弄清楚,但后来你的帖子救了我!【参考方案9】:

我是这样用的:

NSLog(@"%@", [self.view subviews]);

在 UIViewController 中。

【讨论】:

【参考方案10】:

以我的方式,UIView 的类别或扩展比其他的要好得多 而递归是获取所有子视图的关键

了解更多:

https://github.com/ZhipingYang/XYDebugView

目标-C

@implementation UIView (Recurrence)

- (NSArray<UIView *> *)recurrenceAllSubviews

    NSMutableArray <UIView *> *all = @[].mutableCopy;
    void (^getSubViewsBlock)(UIView *current) = ^(UIView *current)
        [all addObject:current];
        for (UIView *sub in current.subviews) 
            [all addObjectsFromArray:[sub recurrenceAllSubviews]];
        
    ;
    getSubViewsBlock(self);
    return [NSArray arrayWithArray:all];

@end

示例

NSArray *views = [viewController.view recurrenceAllSubviews];

斯威夫特 3.1

extension UIView 
    func recurrenceAllSubviews() -> [UIView] 
        var all = [UIView]()
        func getSubview(view: UIView) 
            all.append(view)
            guard view.subviews.count>0 else  return 
            view.subviews.forEach getSubview(view: $0) 
        
        getSubview(view: self)
        return all
    

示例

let views = viewController.view.recurrenceAllSubviews()

直接使用sequence函数获取所有子视图

let viewSequence = sequence(state: [viewController.view])  (state: inout [UIView] ) -> [UIView]? in
    guard state.count > 0 else  return nil 
    defer 
        state = state.map $0.subviews .flatMap $0 
    
    return state

let views = viewSequence.flatMap $0 

【讨论】:

【参考方案11】:

简单的 Swift 示例:

 var arrOfSub = self.view.subviews
 print("Number of Subviews: \(arrOfSub.count)")
 for item in arrOfSub 
    print(item)
 

【讨论】:

【参考方案12】:

未打印 UITableViewCell 中的子视图的原因是您必须输出顶层的所有子视图。单元格的子视图不是您视图的直接子视图。

为了获取 UITableViewCell 的子视图,您需要在打印循环中确定哪些子视图属于 UITableViewCell(使用isKindOfClass:),然后循环遍历它的子视图

编辑:Easy UIView Debugging 上的这篇博文可能会有所帮助

【讨论】:

【参考方案13】:

我写了一个类别来列出视图控制器持有的所有视图,该视图控制器的灵感来自之前发布的答案。

@interface UIView (ListSubviewHierarchy)
- (NSString *)listOfSubviews;
@end

@implementation UIView (ListSubviewHierarchy)
- (NSInteger)depth

    NSInteger depth = 0;
    if ([self superview]) 
        deepth = [[self superview] depth] + 1;
    
    return depth;


- (NSString *)listOfSubviews

    NSString * indent = @"";
    NSInteger depth = [self depth];

    for (int counter = 0; counter < depth; counter ++) 
        indent = [indent stringByAppendingString:@"  "];
    

    __block NSString * listOfSubviews = [NSString stringWithFormat:@"\n%@%@", indent, [self description];

    if ([self.subviews count] > 0) 
        [self.subviews enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) 
            UIView * subview = obj;
            listOfSubviews = [listOfSubviews stringByAppendingFormat:@"%@", [subview listOfSubviews]];
        ];
    
    return listOfSubviews;

@end

要列出视图控制器持有的所有视图,只需NSLog("%@",[self listOfSubviews]),其中self 表示视图控制器本身。虽然效率不高。

另外,您可以使用NSLog(@"\n%@", [(id)self.view performSelector:@selector(recursiveDescription)]); 做同样的事情,我认为它比我的实现更有效。

【讨论】:

【参考方案14】:

你可以尝试一个花哨的数组技巧,比如:

[self.view.subviews makeObjectsPerformSelector: @selector(printAllChildrenOfView)];

只有一行代码。当然,您可能需要调整您的方法printAllChildrenOfView,使其不带任何参数或创建新方法。

【讨论】:

【参考方案15】:

兼容 Swift 2.0

这里有一个递归方法来获取一个通用视图的所有子视图:

extension UIView 
  func subviewsList() -> [UIView] 
      var subviews = self.subviews
      if subviews.count == 0 
          return subviews + []
      
      for v in subviews 
         subviews += v.listSubviewsOfView()
      
      return subviews
  

所以你可以用这种方式到处调用:

let view = FooController.view
let subviews = view.subviewsList()

【讨论】:

【参考方案16】:

最短的解决方案

for subview in self.view.subviews 
    print(subview.dynamicType)

结果

UIView
UIView
UISlider
UISwitch
UITextField
_UILayoutGuide
_UILayoutGuide

备注

如您所见,此方法不会递归地列出子视图。请参阅其他一些答案。

【讨论】:

【参考方案17】:

这是this答案的重写:

您必须首先获取要打印其所有子视图的对象的指针/引用。有时您可能会发现通过其子视图访问该对象更容易找到该对象。喜欢po someSubview.superview。这会给你类似的东西:

Optional<UIView>
  ▿ some : <FacebookApp.WhatsNewView: 0x7f91747c71f0; frame = (30 50; 354 636); clipsToBounds = YES; layer = <CALayer: 0x6100002370e0>>
FaceBookApp 是你的应用名称 WhatsNewView 是您的superview类型 0x7f91747c71f0 是指向父视图的指针。

要打印superView,必须使用断点。


现在要执行此步骤,您只需单击“查看调试层次结构”。无需断点

那么你可以轻松做到:

po [0x7f91747c71f0 recursiveDescription]

这对我来说返回了类似的东西:

<FacebookApp.WhatsNewView: 0x7f91747c71f0; frame = (30 50; 354 636); clipsToBounds = YES; layer = <CALayer: 0x6100002370e0>>
   | <UIStackView: 0x7f91747c75f0; frame = (45 60; 264 93); layer = <CATransformLayer: 0x610000230ec0>>
   |    | <UIImageView: 0x7f916ef38c30; frame = (10.6667 0; 243 58); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x61000003b840>>
   |    | <UIStackView: 0x7f91747c8230; frame = (44.6667 58; 174.667 35); layer = <CATransformLayer: 0x6100006278c0>>
   |    |    | <FacebookApp.CopyableUILabel: 0x7f91747a80b0; baseClass = UILabel; frame = (44 0; 86.6667 16); text = 'What's New'; gestureRecognizers = <NSArray: 0x610000c4a770>; layer = <_UILabelLayer: 0x610000085550>>
   |    |    | <FacebookApp.CopyableUILabel: 0x7f916ef396a0; baseClass = UILabel; frame = (0 21; 174.667 14); text = 'Version 14.0.5c Oct 05, 2...'; gestureRecognizers = <NSArray: 0x610000c498a0>; layer = <_UILabelLayer: 0x610000087300>>
   | <UITextView: 0x7f917015ce00; frame = (45 183; 264 403); text = '   •   new Adding new feature...'; clipsToBounds = YES; gestureRecognizers = <NSArray: 0x6100000538f0>; layer = <CALayer: 0x61000042f000>; contentOffset: 0, 0; contentSize: 264, 890>
   |    | <<_UITextContainerView: 0x7f9170a13350; frame = (0 0; 264 890); layer = <_UITextTiledLayer: 0x6080002c0930>> minSize = 0, 0, maxSize = 1.7976931348623157e+308, 1.7976931348623157e+308, textContainer = <NSTextContainer: 0x610000117b20 size = (264.000000,340282346638528859811704183484516925440.000000); widthTracksTextView = YES; heightTracksTextView = NO>; exclusionPaths = 0x61000001bc30; lineBreakMode = 0>
   |    |    | <_UITileLayer: 0x60800023f8a0> (layer)
   |    |    | <_UITileLayer: 0x60800023f3c0> (layer)
   |    |    | <_UITileLayer: 0x60800023f360> (layer)
   |    |    | <_UITileLayer: 0x60800023eca0> (layer)
   |    | <UIImageView: 0x7f9170a7d370; frame = (-39 397.667; 36 2.33333); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x60800023f4c0>>
   |    | <UIImageView: 0x7f9170a7d560; frame = (258.667 -39; 2.33333 36); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x60800023f5e0>>
   | <UIView: 0x7f916ef149c0; frame = (0 587; 354 0); layer = <CALayer: 0x6100006392a0>>
   | <UIButton: 0x7f91747a8730; frame = (0 0; 0 0); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x610000639320>>
   |    | <UIButtonLabel: 0x7f916ef00a80; frame = (0 -5.66667; 0 16); text = 'See More Details'; opaque = NO; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x610000084d80>>

你一定猜到了我的超级视图有 4 个子视图:

一个stackView(stackView本身有一个图像和另一个stackView(这个stackView有2个自定义标签)) 一个文本视图 一个视图 一个按钮

这对我来说相当新,但帮助我调试了我的视图框架(以及文本和类型)。我的一个子视图没有显示在屏幕上,所以使用了 recursiveDescription,我意识到我的一个子视图的宽度是 0... 所以我纠正了它的约束并且子视图出现了。

【讨论】:

【参考方案18】:

或者,如果您想从 UIView 扩展返回一个包含所有子视图(和嵌套子视图)的数组:

func getAllSubviewsRecursively() -> [AnyObject] 
    var allSubviews: [AnyObject] = []

    for subview in self.subviews 
        if let subview = subview as? UIView 
            allSubviews.append(subview)
            allSubviews = allSubviews + subview.getAllSubviewsRecursively()
        
    

    return allSubviews

【讨论】:

【参考方案19】:

C# Xamarin 版本:

void ListSubviewsOfView(UIView view)

    var subviews = view.Subviews;
    if (subviews.Length == 0) return;

    foreach (var subView in subviews)
    
        Console.WriteLine("Subview of type 0", subView.GetType());
        ListSubviewsOfView(subView);
    

或者,如果您想查找我使用的特定类型的所有子视图:

List<T> FindViews<T>(UIView view)

    List<T> allSubviews = new List<T>();
    var subviews = view.Subviews.Where(x =>  x.GetType() == typeof(T)).ToList();

    if (subviews.Count == 0) return allSubviews;

       foreach (var subView in subviews)
       
            allSubviews.AddRange(FindViews<T>(subView));
        

    return allSubviews;


【讨论】:

【参考方案20】:

我已经在UIView 的类别中完成了它,只需调用传递索引的函数以使用漂亮的树格式打印它们。这只是James Webster 发布的答案的另一种选择。

#pragma mark - Views Tree

- (void)printSubviewsTreeWithIndex:(NSInteger)index

    if (!self)
    
        return;
    


    NSString *tabSpace = @"";

    @autoreleasepool
    
        for (NSInteger x = 0; x < index; x++)
        
            tabSpace = [tabSpace stringByAppendingString:@"\t"];
        
    

    NSLog(@"%@%@", tabSpace, self);

    if (!self.subviews)
    
        return;
    

    @autoreleasepool
    
        for (UIView *subView in self.subviews)
        
            [subView printViewsTreeWithIndex:index++];
        
    

希望对你有帮助:)

【讨论】:

【参考方案21】:
- (NSString *)recusiveDescription:(UIView *)view

    NSString *s = @"";
    NSArray *subviews = [view subviews];
    if ([subviews count] == 0) return @"no subviews";

    for (UIView *subView in subviews) 
         s = [NSString stringWithFormat:@"<%@; frame = (%f %f : %f %f) \n ",NSStringFromClass([subView class]), subView.frame.origin.x, subView.frame.origin.y ,subView.frame.size.width, subView.frame.size.height];  
        [self recusiveDescription:subView];
    
    return s;

【讨论】:

【参考方案22】:

self.view.subviews 维护视图的层次结构。要获取 uitableviewcell 的子视图,您必须执行以下操作。

 for (UIView *subView in self.view.subviews) 
      if ([subView isKindOfClass:[UITableView class]]) 
            for (UIView *tableSubview in subView.subviews) 
                .......
            
      
 

【讨论】:

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