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POAuto Layout with UITextField causes exception
 

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  1. POAuto Layout with UITextField causes exception
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    <p>I'd like to position a <strong>UITextField</strong> inside a <strong>UIViewController</strong> view using auto layout (dynamic resizing and a 5 pt margin between the textfield and its superview). I create the view programmatically using the <strong>loadView</strong> method.</p> <p>Header of UIViewController</p> <p><code>@property (weak, nonatomic) UITextField *textField;</code></p> <p>Implementation</p> <pre><code>-(void)loadView{ //Frame UIView *frame = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 40)]; [self setView:frame]; [self.view setBackgroundColor:[UIColor redColor]]; //TextField [self.textField setDelegate:self]; [self.textField setTranslatesAutoresizingMaskIntoConstraints:NO]; [self.textField setBackgroundColor:[UIColor blueColor]]; [frame addSubview:self.textField]; [frame addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(5@50)-[textField(==10@10)]-(5@50)-|" options:0 metrics:nil views:@{@"textField" : self.textField}]]; [frame addConstraints:[NSLayoutConstraint constraintsWithVisualFormat: @"V:|-(5@50)-[textField(==10@10)]-(5@50)-|" options:0 metrics:nil views:@{@"textField" : self.textField}]]; // //Test with UIView instead // UIView *sub = [[UIView alloc]init]; // [sub setTranslatesAutoresizingMaskIntoConstraints:NO]; // [sub setBackgroundColor:[UIColor greenColor]]; // [frame addSubview:sub]; // // [frame addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(5@50)-[sub(==10@10)]-(5@50)-|" // options:0 // metrics:nil // views:@{@"sub" : sub}]]; // // [frame addConstraints:[NSLayoutConstraint constraintsWithVisualFormat: @"V:|-(5@50)-[sub(==10@10)]-(5@50)-|" // options:0 // metrics:nil // views:@{@"sub" : sub}]]; </code></pre> <p>Running this throws an exception. Curiously using a UIView ("sub") as subview instead (the part commented out) does work as expected.</p> <p>Ouput:</p> <p><img src="https://i.stack.imgur.com/LiD8M.png" alt="Auto Layout with UIView"></p> <p>Shouldn't the textfield behave just like this UIView? How come the textField causes an exception?</p> <hr> <p>New finding: The app crashes only when I use <strong>addConstraints</strong> on the <strong>self.textField</strong>. If I remove those two calls I spare the crash, however the textfield doesn't show up either.</p>
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    1. COWhat exception do you get?
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      1. POAuto Layout with UITextField causes exception
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    2. COIt says SIGABRT in the AppDelegate, line: "return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));" I cannot find something more specific in the error log.
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    3. COWhere do you create textField? Do you create it in code, or is it an IBOutlet to a text field you created in IB? If I just alloc init a text field as the first line of your code, it no longer crashes (the constraints don't work properly, but at least it doesn't crash).
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