UITextField 上的上下文 0x0 无效(Xcode 5) [英] Invalid context 0x0 on UITextField (Xcode 5)

问题描述

我在我的应用中使用了 UITextField.我正在使用 [texfield becomeFirstResponder].这工作得很好，并在加载视图时加载键盘.但是，当我在 UITextField 出现后再次单击它时会出现此错误.我不明白为什么，但这是我得到的输出:

I am using a UITextField in my app. I am using [texfield becomeFirstResponder]. This works just fine and loads the keyboard when the view is loaded. However, this error comes up when I click on the UITextField again after it has been brought up. I don't understand exactly why, but here is the output I am getting:

CGContextSetFillColorWithColor: invalid context 0x0.
CGContextSetStrokeColorWithColor: invalid context 0x0. 
CGContextSaveGState: invalid context 0x0. 
CGContextSetFlatness: invalid context 0x0. 
CGContextAddPath: invalid context 0x0. 
CGContextDrawPath: invalid context 0x0. 
CGContextRestoreGState: invalid context 0x0. 
CGContextSaveGState: invalid context 0x0. 
CGContextSetFlatness: invalid context 0x0. 
CGContextAddPath: invalid context 0x0.
CGContextDrawPath: invalid context 0x0. 
CGContextRestoreGState: invalid context 0x0.

这是我的代码:

// ViewController.h
@interface ViewController : UIViewController
@property (strong, nonatomic) IBOutlet UITextField *textField;

@end


// ViewController.m
@synthesize textField;

- (void)viewDidLoad
{
    [textField becomeFirstResponder];
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

推荐答案

我相信您已经发现了一个 iOS 错误(或者至少是一个模拟器错误).您可以更简单地重现它:

I believe you've found an iOS bug (or at least a simulator bug). You can reproduce it even more simply:

• 新建项目(单视图)
• 将 UITextField 拖到 Storyboard 上
• 运行
• 点击 UITextField.
• 点击关闭 UITextField
• 点击 UITextField
• (在某些情况下，您需要再次单击关闭 UITextField)
• 观察错误

我建议打开雷达.

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