根据内容自动增加视图的高度

Question

Situation

I have a (vertical) UIStackView containing both a plain UIView of height 50 (named sliderView ) and a UILabel of height 36 defined in my storyboard. The label's alpha property is initially set to 0.0 to make it invisible.

In the controller's viewDidLoad I use UIViewController Containment to add another view controller's view to as a subview of sliderView . This new subview does not necessarily match sliderViews height. It might actually a fair bit taller.

At first, this setup looks fine. Once I make the label visible, I see that it still starts at a y-position of 50 . So, the sliderView did not automatically stretch to use it's new child's height. Makes sense.

Question

I thought that I could easily just call sizeToFit on sliderView to make those two heights fit. Unfortunately, this does not seem to work. Am I misunderstanding something here? Thanks!

Answer 1

Use following method to get the CGSize required for NSString text.

- (CGSize)getHeightForText:(NSString *)text havingWidth:(CGFloat)widthValue andFont:(UIFont *)font {
CGSize size = CGSizeZero;
if (text) {
    CGRect frame = [text boundingRectWithSize:CGSizeMake(widthValue, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{ NSFontAttributeName:font } context:nil];
    size = CGSizeMake(frame.size.width, frame.size.height+20.0f);
}
return size;
}

Here width parameter is the width of your label and font is the font specified for your label . Call CGSize.height to get the height.