Question

您看到我正在创建一个完全自定义的导航栏，当我创建后退按钮时，它不会保留在正确的位置，因为您可以在代码下方看到。

这是我的应用代码

- (void)viewDidLoad
{
    [super viewDidLoad];
    if(self.navigationController.viewControllers.count > 1) {
    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];

    [backButton setTitle:@"" forState:UIControlStateNormal];
    [backButton setBackgroundImage:[UIImage imageNamed:@"backButton.png"] forState:UIControlStateNormal];
    [backButton addTarget:self action:@selector(didTapBackButton:) forControlEvents:UIControlEventTouchUpInside];
    backButton.frame = CGRectMake(0.0f, 0.0f, 44.0f, 45.0f);
    UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];

    self.navigationItem.leftBarButtonItem = backButtonItem;
}

}

Pic http://s8.postimage.org/k5faqz0jp/Screen_Shot_2013_01_24_at_5_30_10_PM.png

Answer 1

我认为你可以修改contentEdgeInsets来定位按钮的位置。

这样的事情：

[backButton setContentEdgeInsets：UIEdgeInsetsMake（5,0，-5,0）];

来自UIButton Class Reference

<强> contentEdgeInsets

围绕所有按钮内容的矩形的插入或开始边距。

@property（非原子）UIEdgeInsets contentEdgeInsets

讨论使用此属性调整按钮内容的有效绘图矩形并重新定位。内容包括按钮图像和按钮标题。您可以为四个插图（顶部，左侧，底部，右侧）中的每一个指定不同的值。正值会缩小或缩小，使其靠近按钮的中心。负值会扩展或偏离该边缘。使用UIEdgeInsetsMake函数为此属性构造值。默认值为UIEdgeInsetsZero。

Answer 2

您可以渲染左侧有一些间距的较大图像。

UIImage *origImage = [UIImage imageNamed:@"button-thin-hamburger.png"];
UIGraphicsBeginImageContextWithOptions(CGSizeMake(origImage.size.width + 10, origImage.size.height), NO, 0.0);
[origImage drawInRect:CGRectMake(10, 0, origImage.size.width, origImage.size.height)];
UIImage *buttonImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@""
                                                               style:UIBarButtonItemStylePlain
                                                              target:nil
                                                              action:nil];
self.navigationItem.backBarButtonItem = backButton;

[[UINavigationBar appearance] setBackIndicatorImage:buttonImage];
[[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:buttonImage];

Answer 3

嗯，你不能改变，你必须隐藏它。

看看这里发布的这个页面：

http://rafaelsteil.com/2011/07/23/crappy-ios-apis-uinavigationcontroller/

Can't change back button title but I can hide it

Answer 4

你需要先隐藏NavigationBar ......

    [self.navigationController setNavigationBarHidden:YES animated:NO];

然后创建Custom UIButton ..

    UIButton *btn1=[UIButton  buttonWithType:UIButtonTypeCustom];
    [btn1 setFrame:CGRectMake(10, 0, 60, 40)];// Frame u want

    [btn1 setImage:[UIImage imageNamed:@"BT_ipad_P_backbward@2x.png"] forState:UIControlStateNormal];
    [btn1 addTarget:self action:@selector(Click_backward:) forControlEvents: UIControlEventTouchUpInside];
btn1.tintColor=[UIColor purpleColor];
    [self.view addSubview:btn1];

如何更改iOS上后退按钮的位置？

4 个答案: