UITextField settext不工作 [英] UITextField settext not working

问题描述

这是令我沮丧的。我是一个初学者程序员，无法弄清楚为什么文本没有改变。

This is frustrating the hell out of me. I am a beginner programmer and cannot figure out why the text is not being changed.

这里是我的方法，它应该设置一个UITextField的文本：

Here is my method which is supposed to set the text of a UITextField:

-(void)updateDays:(NSInteger)days
{
    NSString* daysString = [[NSString alloc] initWithFormat:@"%d", days];
    [daysTextField setText:daysString];
    [daysString release];
}

无论什么原因都没有发生。

For whatever reason nothing is happening.

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推荐答案

行为什么不是这行工作，使用调试器或只是添加一个NSLog之前打印出相关的数据：

Anytime you have a frustration along the lines of "why isn't this line working", use the debugger or just add an NSLog before it to print out the relevant data:

NSLog(@"updateDays: %@ %@ <= %@", daysTextField, daysTextField.text, daysString);

然后你知道行（a）被执行，认为他们是，和（c）价值是合理的。

Then you know the line (a) is getting executed, (b) the variables are the ones you think they are, and (c) the values are reasonable.

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