UIProgressView have different position at runtime

Question

I place a UIProgressView on an XIB file. At first it goes well. After when I set its height via auto layout to be 20, problem occurred. The Progress View always got its position at the most top-left of the screen. even I use

[self.progress setFrame:CGRectMake(93, 100, self.scrollView.frame.size.width, self.scrollView.frame.size.height)];

still don't work for me at all.

Thank you very much for any help.

don't set frame when using autolayout, use instead constraints — nsinvocation, Jul 13 '15 at 06:36

score 0 · Accepted Answer · answered Jul 13 '15 at 06:58

use size constraints as outlets. Then you can easy change values of those constraints. It's not really recommended to modify frame when using auto-layout.

declare a property:

@property (strong, nonatomic) IBOutlet NSLayoutConstraint *heightConstraint;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *widthConstraint;

and in the implementation:

 self.heightConstraint = self.scrollView.frame.size.height;
 self.widthConstraint= self.scrollView.frame.size.width;

Alternatively you can try to set frame in viewDidLayoutSubviews but it's not recommended when using auto-layout.

Solved! I tried to do it in viewDidLayoutSubViews and it worked. — BlueBookBi., Jul 13 '15 at 08:12

UIProgressView have different position at runtime

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