iOS UISegmentedControl very strange problem

[namanhams]

I have a UITableViewController in a UINavigationController. When the user tap 1 row of the table view, then the navigation controller will push an UIViewController called A.

When A.view doesn't have any UISegmentedControl, then every works perfect.
When A.view has an UISegmentedControl, then the program hangs. It doesn't crash, it doesn't show any error. It just freezes.

I'm gonna be crazy with this problem. Please help. Thanks.

 

[namanhams]

Here's some code :

// Doesn't hang
UISegmentedControl *control = [[UISegmentedControl alloc] init];
[self.view addSubview:control];

// Hang
UISegmentedControl *control = [[UISegmentedControl alloc] init];
[control insertSegmentWithTitle:@"1" atIndex:0 animated:FALSE];
[self.view addSubview:control];

 

[dejo]

What happens if you try?:

UISegmentedControl *control = [[UISegmentedControl alloc] init];
[control insertSegmentWithTitle:@"1" atIndex:0 animated:FALSE];
[control insertSegmentWithTitle:@"2" atIndex:1 animated:FALSE];
[self.view addSubview:control];

 

[namanhams]

It all hangs whenever you create a UISegmentedControl with some labels.

I've just found out some hint which may be interesting :

I've created a UILabel category, which has only 1 method :

- (void) sizeToFit;

If i remove the above, every thing will works perfect.

If i include the above, then it hangs whenever i create a UISegmentedControl with some labels, although my code doesn't use the 'sizeToFit' method at all.

So i guess, the UISegmentedControl implementation actually creates a category on UILabel, which has a method that accidently has the name 'sizeToFit'. So what i did is actually redefining it.


Please correct me if i'm wrong. Thanks.

 

[robbieduncan]

You have overridden an existing method. Unless you are intentionally overriding it and providing correct, consistent behaviour with what this is meant to do then don't override it: this is certainly going to be called to size the labels used internally by the segmented control.

 

[dejo]

This thread at iPhone Dev SDK may shed some more light on your issue:

http://www.iphonedevsdk.com/forum/iphone-sdk-development/11648-change-uisegmentedcontrol-font-size.html

Seems the subviews of a UISegmentedControl are UISegments and the subviews of each UISegment are UILabels.

So, question is, why do you need to UILabel category with sizeToFit? UILabel already inherits that method from UIView (its superclass).