为什么这个代码适用于iPhone 5,4和4但不适用于5s？

Question

我有以下代码为UIBarButton我的项目添加一些s.这适用于以下情况:

全部在iOS 7.1上

• 模拟器iPhone Retina 3.5英寸;
• 模拟器iPhone Retina 4英寸;
• 模拟器iPhone Retina 4英寸(64位)
• Iphone 4
• iPhone 4s

我没有iPhone 5设备可以测试.

它不适用于新的iPhone 5s.有什么不同？

这是代码:

    -(void)setupNavigationBar
{
    self.saveSearchButton =  [UIButton buttonWithType:UIButtonTypeCustom];
    [self.saveSearchButton setImage:[UIImage imageNamed:@"Save Search"] forState:UIControlStateNormal];
    [self.saveSearchButton setImage:[UIImage imageNamed:@"Save Search Active"] forState:UIControlStateHighlighted|UIControlStateSelected];
    [self.saveSearchButton addTarget:self action:@selector(saveSearchButtonpressed)forControlEvents:UIControlEventTouchUpInside];
    [self.saveSearchButton setFrame:CGRectMake(0, 0, 23, 31)];

     self.changeLayutButton =  [UIButton buttonWithType:UIButtonTypeCustom];
    [self.changeLayutButton setImage:[UIImage imageNamed:@"View List"] forState:UIControlStateNormal];
    [self.changeLayutButton setImage:[UIImage imageNamed:@"View Grid"] forState:UIControlStateHighlighted|UIControlStateSelected];
    [self.changeLayutButton addTarget:self action:@selector(changeViewLayoutButtonPressed)forControlEvents:UIControlEventTouchUpInside];
    [self.changeLayutButton setFrame:CGRectMake(0, 0, 23, 31)];

    self.sortByButton =  [UIButton buttonWithType:UIButtonTypeCustom];
    [self.sortByButton setImage:[UIImage imageNamed:@"Sort By"] forState:UIControlStateNormal];
    [self.sortByButton setImage:[UIImage imageNamed:@"Sort By Active"] forState:UIControlStateHighlighted|UIControlStateSelected];
    [self.sortByButton addTarget:self action:@selector(sortByButtonPressed)forControlEvents:UIControlEventTouchUpInside];
    [self.sortByButton setFrame:CGRectMake(0, 0, 23, 31)];

    UIBarButtonItem *fixedItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
    fixedItem.width = 20;

    UIBarButtonItem *saveSearchButton = [[UIBarButtonItem alloc] initWithCustomView:self.saveSearchButton];
    UIBarButtonItem *changeViewButton = [[UIBarButtonItem alloc] initWithCustomView:self.changeLayutButton];
    UIBarButtonItem *sortByButton = [[UIBarButtonItem alloc] initWithCustomView:self.sortByButton];


    NSArray *barbuttonitems = @[sortByButton, fixedItem, changeViewButton, fixedItem,saveSearchButton];

    self.navigationItem.rightBarButtonItems = barbuttonitems;

    self.lastLayoutUsed = [[NSUserDefaults standardUserDefaults]objectForKey:@"LastLayoutUsed"];

    if ([self.lastLayoutUsed isEqualToString:@"GridLayout"]){
        self.changeLayutButton.selected = YES;
        [NSTimer scheduledTimerWithTimeInterval:0.0 target:self selector:@selector(highlightButton:) userInfo:self.changeLayutButton repeats:NO];
    }
}

我已经完成了代码,并且所有属性都不是nil并且具有有效值.我已经检查过所有图像也是正确的一面.

如何在模拟器上的每个设备上工作,而不是真正的iPhone 5S？

此外,由于这两款手机(iPhone 4S和5S)拥有完全相同的屏幕宽度和iOS版本,我真的很困惑？

按钮根本不显示.没有编译器警告和没有控制台错误.

UPDATE

在iPhone 5上测试了上面的代码,它运行得很好.这导致相信它必须与iPhone 5S的64位有关吗？

更新2

从方法中删除了所有代码并将其更改为一个非常简单的按钮,如下所示:

         self.saveSearchButton =  [UIButton buttonWithType:UIButtonTypeCustom];
[self.saveSearchButton setTitle:@"Save" forState:UIControlStateNormal];
    [self.saveSearchButton setTintColor:[UIColor blueColor]];
    UIBarButtonItem *saveSearchButton = [[UIBarButtonItem alloc] initWithCustomView:self.saveSearchButton];
    self.navigationItem.rightBarButtonItem = saveSearchButton;

现在,这不适用于任何设备或模拟器.

我在这做错了什么？

更新3 - 解决方案!

是的,所以这是一件简单的事情,引起了所有这些大惊小怪.我宣称我的UIButton weak不是strong- 我的印象是UI元素需要很弱,因为它们常常偏离视线？

我在评论部分的帮助下找到了这个答案.

这也无法解释为什么它在声明为iPhone 4S和iPhone 5时有效weak.它也适用于声明为64位模拟器weak

这是否意味着64位模拟器将用作指南,并且必须在设备上进行实际测试,因为在UIKit测试时模拟器似乎不准确？

我想知道更多关于此事的信息.

Answer 1

问题是[UIButton buttonWithType:UIButtonTypeCustom]不会留下Apple Docs中所述的对象实例.UIBarButton期待一些实例.https://developer.apple.com/library/ios/documentation/uikit/reference/UIButton_Class/UIButton/UIButton.html

AppleDocs中所述的解决方案是使用alloc + init构造来创建一个按钮.

buttonWithType:

"此方法是一个方便构造函数,用于创建具有特定配置的按钮对象.如果您继承UIButton,则此方法不返回子类的实例.如果要创建特定子类的实例,则必须分配/初始化按钮直."