在iOS 7.1中，UISearchBar的文本和占位符属性不再起作用 [英] In iOS 7.1, UISearchBar's text and placeholder properties don't work anymore

问题描述

从iOS 7.1 开始，我无法阅读文本，也无法设置UISearchBar的占位符。 text属性始终返回nil，搜索栏始终为空白色矩形。在iOS 7.0 及以下，我没有遇到过这样的问题。 7.1是否要求我以不同的方式处理UISearchBars以使 text 和占位符工作？

Starting from iOS 7.1, I have not been able to read the text nor set the placeholder of UISearchBar. The text property always returns nil and the search bar is always a blank white rectangle. In iOS 7.0 and below, I had no such problems. Does 7.1 require me to treat UISearchBars differently to make text and placeholder work?

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 44.0)];
    self.searchBar.placeholder = @"placeholder doesn't work in 7.1";
    [self.view addSubview:self.searchBar];

    self.button = [[UIButton alloc] initWithFrame:CGRectMake(0.0, 44.0, 100.0, 44.0)];
    self.button.backgroundColor = [UIColor redColor];
    [self.button setTitle:@"print text" forState:UIControlStateNormal];
    [self.button addTarget:self action:@selector(printSearchText) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.button]; 
}

- (void)printSearchText
{
    NSLog(@"print nil here: %@", self.searchBar.text);
}

推荐答案

这可能是也可能不是与您的问题有关，但是我们在 UISearchBar 上定义的类别引起了类似的问题。我们添加了一个 textField 属性，出于一些我不会涉及的hacky原因。似乎Apple在iOS 7.1中添加了他们自己的内部 textField 属性，而我们正在干扰它。

This may or may not be related to your problem, but we had a similar problem caused by a category we'd defined on UISearchBar. We'd added a textField property for some hacky reasons I won't go into. It appears that Apple added their own internal textField property in iOS 7.1 and ours was interfering with it.

这是总是为您的类别方法/属性名称添加前缀的充分理由。 ：）

This is a good reason to always prefix your category method/property names. :)

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