UIBarButtonItem在用作左侧或右侧导航栏项目时,自定义视图未在iOS 7上正确对齐
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以下代码通过ios 6运行:
UIButton *myButton = nil;
myButton = [UIButton buttonWithType:UIButtonTypeCustom];
myButton.bounds = CGRectMake(0,0,44,30);
// setup myButton's images, etc.
UIBarButtonItem *item = nil;
item = [[UIBarButtonItem alloc] initWithCustomView:customButton];
这是按钮应该如何对齐:
但是,在iOS 7上,按钮似乎从右侧或左侧偏移了太多像素:
如何才能使我的自定义条形按钮项目正确对齐?
适用于iOS11!
您可以使用负灵活空格和rightBarButtonItems属性而不是rightBarButtonItem:
UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
spacer.width = -10; // for example shift right bar button to the right
self.navigationItem.rightBarButtonItems = @[spacer, yourBarButton];
我想出了jaredsinclair的缩短版本的方法:
- (UIEdgeInsets)alignmentRectInsets {
return [self isLeftButton] ? UIEdgeInsetsMake(0, 9.0f, 0, 0) : UIEdgeInsetsMake(0, 0, 0, 9.0f);
}
- (BOOL)isLeftButton {
return self.frame.origin.x < (self.superview.frame.size.width / 2);
}
奇迹般有效。
在ios7中,您可以添加一个虚拟的barbuttonitem来固定左侧空间,您应该首先添加虚拟,对于最后一个
左边的示例,您应该在设置原始项目后添加此项,或者如果您使用storyboard设置按钮,则应在viewdidload中添加。
NSMutableArray *buttons = [[NSMutableArray alloc] init];
UIBarButtonItem *spacerItem = [[UIBarButtonItem alloc] init];
[buttons addObject:spacerItem];
for(UIBarButtonItem *item in self.leftBarButtonItems){
[buttons addObject:item];
}
[self setLeftBarButtonItems:[NSArray arrayWithArray:buttons] animated:NO];
更改UIButton
的以下内容
控制 - >对齐 - >水平对齐右对齐
它只是简单地调整imageEdgeInsets
来修复这个bug。
试试这个。
UIButton *actionBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 40, 40)];
[actionBtn setImage:[UIImage imageNamed:@"arrow.png"] forState:UIControlStateNormal];
[actionBtn addTarget:self action:@selector(goToSetting) forControlEvents:UIControlEventTouchUpInside];
actionBtn.imageEdgeInsets = UIEdgeInsetsMake(0, 9, 0, -9);
UIBarButtonItem *profileBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:actionBtn];
self.topViewController.navigationItem.rightBarButtonItems = @[profileBarButtonItem];
在iOS 11中测试过
public lazy var navigationBackBarButton : UIBarButtonItem = {
let backBarButtonIcon = <Image Literal here>
let backBarButton = UIBarButtonItem(image: backBarButtonIcon, style: .plain, target: self, action: #selector(self.backBarButtonTouched(_:)))
backBarButton.imageInsets = UIEdgeInsets(top: 0.0, left: -9.0, bottom: 0.0, right: 0.0)
return backBarButton
}()
2018年,iOS 11 +,Swift 4.x,这对我有用。
结合最佳答案:
属性
internal lazy var button_Favorite: UIButton = {
let button = UIButton(type: .custom)
button.setImage(.favNormal, for: .normal)
button.contentHorizontalAlignment = .right
button.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, -9.0)
return button
}()
在viewDidLoad
:
let barButton = UIBarButtonItem(customView: self.button_Favorite)
self.button_Favorite.frame = CGRect(x: 0, y: 0, width: 40.0, height: 44.0)
let negativeSpacer = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.fixedSpace, target: nil, action: nil)
negativeSpacer.width = -10.0
self.navigationItem.rightBarButtonItems = [negativeSpacer, barButton]
为了解决这个bug,你必须继承UIButton,以便你可以覆盖alignmentRectInsets
。根据我的测试,您需要返回具有正向右偏移或正向左偏移的UIEdgeInsets,具体取决于按钮位置。这些数字对我来说毫无意义(根据常识,其中至少有一个应该是否定的),但这实际上是有效的:
- (UIEdgeInsets)alignmentRectInsets {
UIEdgeInsets insets;
if (IF_ITS_A_LEFT_BUTTON) {
insets = UIEdgeInsetsMake(0, 9.0f, 0, 0);
}
else { // IF_ITS_A_RIGHT_BUTTON
insets = UIEdgeInsetsMake(0, 0, 0, 9.0f);
}
return insets;
}
特别感谢@zev建议我尝试调整alignmentRectInsets。
我已经尝试了上面的所有答案,但对我来说没有任何效果。这是有效的,如果有人需要这个:
(不需要子类化)
// Add your barButtonItem with custom image as the following
UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStyleBordered target:self action:@selector(categoryButtonPressed)];
// set your custom image
[barButton setImage:categoryImage];
// finally do the magic
barButton.imageInsets = UIEdgeInsetsMake(0.0, -20, 0, 0);
- 看看结果。
注意左侧按钮和右侧按钮的空格(右侧按钮具有默认行为)
好吧,我走了另一个“方向”。我通过使用iOS 7的Storyboard正确排列了所有内容(假设这是继续工作的方式)。然后使用describe子类方法,我用以下实现子类UIButton
。
- (UIEdgeInsets)alignmentRectInsets {
UIEdgeInsets insets;
if (SYSTEM_VERSION_LESS_THAN(@"7.0")) {
if ([self isLeftButton]) {
insets = UIEdgeInsetsMake(0, -10, 0, 0);
} else {
insets = UIEdgeInsetsMake(0, 0, 0, -10);
}
} else {
insets = UIEdgeInsetsZero;
}
return insets;
}
- (BOOL)isLeftButton {
return self.frame.origin.x < (self.superview.frame.size.width / 2);
}
因此,只有当设备处于iOS 7之前时,此代码才会运行。
感谢@jaredsinclair的见解!
@jaredsinclair
这是我的代码。
// Create the tweetly button that will show settings
self.tweetlyDisplay = [NavButton buttonWithType:UIButtonTypeCustom];
[self.tweetlyDisplay setFrame:CGRectMake(0, 0, 90, 44)];
[self.tweetlyDisplay setBackgroundColor:[UIColor clearColor]];
[self.tweetlyDisplay setBackgroundImage:[UIImage imageNamed:@"settings.png"] forState:UIControlStateNormal];
[self.tweetlyDisplay setAdjustsImageWhenHighlighted:NO];
[self.tweetlyDisplay addTarget:self action:@selector(tweetlyPressed:) forControlEvents:UIControlEventTouchUpInside];
// Add the Tweetly button as the left bar button item
// This had a glitch that moves the image to the right somewhat
UIBarButtonItem *leftBarButton = [[UIBarButtonItem alloc] initWithCustomView:self.tweetlyDisplay];
self.navigationItem.leftBarButtonItem = leftBarButton;
看到任何不对的东西?
这是结果。第二张图片不是那么可见,因为我不得不花时间截取屏幕截图并且它仍处于转换状态,但您可以清楚地看到它是如何不正确地抵消的。
良好的正常形象:
坏偏移图像:
大约半秒后,图像然后快速回到原始图像位置。
这是我的NavButton.h和.m的代码:
/**********************************************
NavButton.h
**********************************************/
#import <UIKit/UIKit.h>
@interface NavButton : UIButton
@end
/**********************************************
NavButton.m
**********************************************/
#import "NavButton.h"
@implementation NavButton {
int imageHeight;
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
imageHeight = 44;
}
return self;
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
- (UIEdgeInsets)alignmentRectInsets {
UIEdgeInsets insets;
if ([self isLeftButton]) {
insets = UIEdgeInsetsMake(0, 9.0f, 0, 0);
}
else { // IF ITS A RIGHT BUTTON
insets = UIEdgeInsetsMake(0, 0, 0, 9.0f);
}
return insets;
}
- (BOOL)isLeftButton {
return self.frame.origin.x < (self.superview.frame.size.width / 2);
}
// THIS IS THE TRICK. We make the height of the background rect match the image.
-(CGRect)backgroundRectForBounds:(CGRect)bounds
{
CGRect bgRect = bounds;
bgRect.origin.y = (bounds.size.height - imageHeight)/2.0f;
bgRect.size.height = imageHeight;
return bgRect;
}
@end
这里可以找到一个没有跳跃按钮的更好的解决方案:
在右侧而不是左侧显示 UIToolbar 的 UIBarButtonItem