UITextField settext not working

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

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:daysStri开发者_运维问答ng];
    [daysString release];
}

For whatever reason nothing is happening.

Help appreaciated!

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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);

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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I have experienced this several times, but I think all of them was reasoned by that the UITextField was not initialized at that point.

Set a breakpoint and use debugger to make sure that your UITextField is not nil. You should also check the connection between the .xib file and your code.

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Check if the method is called. If yes check if the textfield is set up properly. Cross check to see if the IBOutlet connections are made to the correct object.

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I meet this problem too .

It's my code:(in viewdidload)

UITextView *tv = [[UITextView alloc]initWithFrame:CGRectMake(0,0,320,50)]];
tv.text = @"12345";
tv.textColor=[UIColor blackColor];
[self.view addSubView:tv];

And the text(12345) doesn't show;

Lastly,I found that when i set textColor to gray,or any color not black,it works;

I think that it's a bug of the simulator.

I use xcode 4.2 and the iphone5.0simulator.