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

Question

以下代码通过iOS 6进行操作：

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];

这就是按钮的对齐方式：

但是，在iOS 7上，该按钮似乎从右侧或左侧偏移了太多像素：

如何让自定义条形按钮项目正确对齐？

Answer 1

直到iOS11工作！

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];

Answer 2

为了修复此错误，您必须继承UIButton的子类，以便覆盖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。这些数字对我来说没有任何意义（根据常识，至少其中一个应该是负数），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。

Answer 3

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（   右键具有默认行为）

Answer 4

好的，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，我使用以下实现子类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！

Answer 5

@jaredsinclair

以下是我的代码。

// 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;

看到哪些不对？

结果如下。第二张图片不是那么明显，因为我不得不花时间截取屏幕截图并且它仍在转换中，但你可以清楚地看到它是如何被不正确地抵消。

良好的正常形象：

Bad Offset Image：

大约半秒钟后，图像会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

Answer 6

这里可以找到一个没有跳跃按钮的更好的解决方案：

Custom UIBarButtonItem alignment off with iOS7

Answer 7

不太喜欢子类化UIButton或从Marius的答案中调来的方法：https://stackoverflow.com/a/19317105/287403

我只是使用了一个简单的包装器，并将按钮的框架的x向负方向移动，直到找到正确的位置。按钮敲击似乎也很好（尽管如果需要，您可以扩展按钮的宽度以匹配负偏移）。

以下是我用来生成新后退按钮的代码：

- (UIBarButtonItem *) newBackButton {
    // a macro for the weak strong dance
    @weakify(self);
    UIButton *backButton = [[UIButton alloc] init];
    [backButton setTitle:@"Back" forState:UIControlStateNormal];
    backButton.titleLabel.font = [UIFont systemFontOfSize:17];
    CGFloat width = [@"Back" boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, CGFLOAT_MAX) options:NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:17]} context:nil].size.width + 27;
    backButton.frame = CGRectMake(-17.5, 0, width + 17.5, 44);
    [backButton setImage:[UIImage imageNamed:@"UINavigationBarBackIndicatorDefault"] forState:UIControlStateNormal];
    [backButton setTitleEdgeInsets:UIEdgeInsetsMake(0, 14, 0, 0)];
    [backButton setTitleColor:mTCOrangeColor forState:UIControlStateNormal];
    backButton.contentEdgeInsets = UIEdgeInsetsZero;
    backButton.imageEdgeInsets = UIEdgeInsetsZero;
    [backButton addEventHandler:^(id sender) {
        // a macro for the weak strong dance
        @strongify(self);
        // do stuff here
    } forControlEvents:UIControlEventTouchUpInside];
    UIView *buttonWrapper = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, 44)];
    [buttonWrapper addSubview:backButton];
    return [[UIBarButtonItem alloc] initWithCustomView:buttonWrapper];
}

Answer 8

我想添加到@jaredsinclair确认回答以下覆盖方法给那些在导航按钮中有文本和/或图像的人，否则文本和图像将不会对齐（只有背景图像）：< / p>

- (UIEdgeInsets) titleEdgeInsets {
if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0"))
{
    if (IF_ITS_A_LEFT_BUTTON) {
    {
        return UIEdgeInsetsMake(0, 0, 0, 9.0f);
    }
    else
    { // IF_ITS_A_RIGHT_BUTTON
        return UIEdgeInsetsMake(0, 9.0f, 0, 0);
    }
}
return [super titleEdgeInsets];
}

- (UIEdgeInsets)imageEdgeInsets {
if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0"))
{
    if (IF_ITS_A_LEFT_BUTTON)
    {
        return UIEdgeInsetsMake(0, 0, 0, 9.0f);
    }
    else
    { // IF_ITS_A_RIGHT_BUTTON
        return UIEdgeInsetsMake(0, 9.0f, 0, 0);
    }
}

return [super imageEdgeInsets];
}

P.S。宏是：

#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)

Answer 9

* 找到解决方案，请在答案结尾处阅读。 *

@jaredsinclair

我和Kyle Begeman有类似的案例

这是按钮

 - (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
    }
    return self;
}

- (UIEdgeInsets)alignmentRectInsets {
    UIEdgeInsets insets;

    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")){
        if ([self isLeftButton]) {
            insets = UIEdgeInsetsMake(0, 9.0f, 0, 0);
        } else {
            insets = UIEdgeInsetsMake(0, 0, 0, 9.0f);
        }
    }else{
        insets = UIEdgeInsetsZero;
    }

    return insets;
}

- (BOOL)isLeftButton {
    return self.frame.origin.x < (self.superview.frame.size.width / 2);
}

我在这种情况下使用它

PBNavigationBarButton *dashboardButton = [PBNavigationBarButton buttonWithType:UIButtonTypeCustom];
    UIImage *dashboardImage = [UIImage imageNamed:@"btn_dashboard.png"];
    UIImage *dashboardImageHighlighted = [UIImage imageNamed:@"btn_dashboard_pressed.png"];

    NSInteger halfImageWidth = ceilf([dashboardImage size].width/2.0f);

    [dashboardButton setBackgroundImage:[dashboardImage stretchableImageWithLeftCapWidth:halfImageWidth topCapHeight:0] forState:UIControlStateNormal];
    [dashboardButton setBackgroundImage:[dashboardImageHighlighted stretchableImageWithLeftCapWidth:halfImageWidth topCapHeight:0] forState:UIControlStateHighlighted];
    [dashboardButton addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    [dashboardButton sizeToFit];

    UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc]  initWithCustomView:dashboardButton];

一切看起来都很棒，但是当我回到之前的VC时，按钮会重新定位。就像一个小小的跳跃。 对我来说，它确实会在一秒钟之后立即跳转。它发生在我从NavigationViewController进行popVC之后。

编辑：下面的答案，Marius的混合方法也帮助了我。

Answer 10

我提出了jaredsinclair方法的缩短版本：

- (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);
}

像魅力一样。

Answer 11

在ios7中你可以添加一个虚拟的barbuttonitem 为了修复左侧空间，你应该首先添加虚拟，直到最后

左边的示例，您应该在设置原始项目后添加此项，或者如果您使用情节提要设置按钮，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];

Answer 12

更改UIButton

的以下内容

  

控制 - ＆gt;对齐 - ＆gt;水平到右对齐

Answer 13

只需调整imageEdgeInsets即可修复此错误。

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];

Answer 14

在iOS 11中进行了测试

 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

    }()

Answer 15

2018年，iOS 11 +，Swift 4.x，对我有用。

结合最重要的答案：

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中：

    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]