UIButton自动布局大小设置

Question

I have a UIButton control placed in the view, there is a large background image set in the button, let's say the size of image is 600 x 300, and the size of button is 100 X 40, now I want to add the constraints to limit the width of button >= 100 and <= 200 depends on the title width.

The problem is that the button width always stretch to 200 instead of the actual title width, because the background image is too large than 200 pixel. But what I want is to make the width fit with title other than the background image.

I have tried to reduce the priority of the button imageview in horizontal using setContentHuggingPriority and setContentCompressionResistancePriority, but unfortunately it doesn't work. Please help!!!

Answer 1

You should create an IBOutlet for a width constraint for your button then you can say something like:

self.buttonWidthConstraint.constant = button.titleLabel?.sizeThatFits(button.frame.size).width

Or if you need it in objective-c:

self.buttonWidthConstraint.constant = [self.button.titleLabel sizeThatFits:self.button.frame.size].width;