进入视图时，撰写UIBarButtonItem会稍微改变位置 [英] Compose UIBarButtonItem changes position slightly when coming into view

问题描述

在导航栏中显示带有UIBarButtonSystemItemCompose按钮的新视图时，该位置会稍微偏离并在视图进入视图后进行调整.

When presenting a new view with a UIBarButtonSystemItemCompose button in the navigation bar, the position is slightly off and adjusts after the view has come into view.

我认为这是iOS(使用8.3版)中的错误.它仅在使用UIBarButtonSystemItemCompose时发生.其他类型的按钮(系统按钮，文本按钮或自定义按钮)则不会发生这种情况.

I think this is a bug in iOS (version 8.3 used). It only happens when using the UIBarButtonSystemItemCompose. It does not happen with other types of Buttons (system, text or custom).

复制此错误所需的唯一代码是将ViewController代码与将要显示的视图一起使用:

The only code needed to replicate this bug is to use this ViewController code with the view that will come into view:

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    UIBarButtonItem* composeBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera
                                      target:nil
                                      action:nil];

    [self.navigationItem setRightBarButtonItem:composeBarButtonItem animated:YES];
}

@end

我已经在GitHub上创建了一个存储库，并使用最少的代码来重现该问题: https://github.com/jvdvleuten/iOSComposeBarButtonItemBug

I have created a repository on GitHub with bare minimum code to reproduce the problem: https://github.com/jvdvleuten/iOSComposeBarButtonItemBug

与此相关的外观: UIBarButtonItems模态显示UINavigationController时的位置，除了我的错误仅在使用UIBarButtonSystemItemCompose时出现.

Looks related to this: UIBarButtonItems shift position when UINavigationController is presented modally, except my bug only appears when using the UIBarButtonSystemItemCompose.

有什么想法吗?

推荐答案

我使用了谢尔盖(Sergey)的答案，但在按钮右侧保留了一个空白区域.我用一个负隔离片固定了它，现在可以很好地工作了:

I used Sergey's answer, but kept an empty space right of my button. I fixed this with a negative spacer, which now works beautifully:

UIBarButtonItem* composeBarButtonItem =
[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCompose
                                              target:nil
                                              action:nil];

UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]
                                       initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace
                                       target:nil action:nil];
negativeSpacer.width = -6;

UIBarButtonItem *dumbBarButtonItem = [UIBarButtonItem new];

self.navigationItem.rightBarButtonItems = @[dumbBarButtonItem, negativeSpacer, self.composeBarButtonItem];

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