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Summary:
When creating a UIButton programmatically with a title and no image, a call to sizeToFit adds top and bottom content insets to the button layout.

Steps to Reproduce:
1. Create a New Project
2. Add a UIButton  subview programmatically in viewDidLoad, e.g. :

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [btn setTitle:@"Tap Me" forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    btn.backgroundColor = [UIColor darkGrayColor];
    btn.titleLabel.backgroundColor = [UIColor blueColor];    
    [btn sizeToFit]; // Resize will set the width and height
    [self.view addSubview:btn];

3. Run in Simulator

Expected Results:
The UIButton documentation should specify any sizing constraint applied when computing sizeThatFit. It seems understandable that a button "too small" would be poor user experience, hence maybe the SDK is enforcing a minimum height and width.

Actual Results:
Top and Bottom content edge insets are added.
The same behaviors occurs when explicitly setting the contentEdgeInsets property to 0. However it is possible to apply a single pixel inset (like btn.contentEdgeInsets = UIEdgeInsetsMake( 0.0, 0.0, 1.0, 0.0);)

Apple Developer Relations16-Sep-2015 09:51 PM

We believe this issue has been addressed.  Please verify this issue with iOS 9 GM (Build: 13A344) and update your bug report at http://bugreport.apple.com/ with the results.

iOS 9 GM (Build: 13A344)
https://developer.apple.com/ios/download/
Posted Date: Sept. 16th, 2015