使用自动布局更改UILabel的字体

Question

Normally, you use:

label.adjustsFontSizeToFitWidth = YES;

to make a label reduce the size of its font whenever it is no longer possible to increase the size of its frame.

Is there any way to make it try an alternate font, like a condensed version of the same font family before it reduces font size?

Answer 1

There are a few good ways to handle this. In IB select your label:

Method 1:

If you click the plus button, you can add specific fonts for a given size class.

In code:

- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
{
    if(self.view.traitCollection.horizontalSizeClass == UIUserInterfaceSizeClassRegular && self.view.traitCollection.verticalSizeClass == UIUserInterfaceSizeClassRegular)
    {
        //iPad here
        myLbl.Font = [UIFont fontWithName:@"Heyo" size:10];
    }
}

The better way, in my opinion, is Method 2:

With this approach, you can either tell the font to shrink up to a certain size, or instead identify a scale factor. Toy with these values until you get the desired result. I also talk about this topic in this tutorial .

In code:

//Minimum font size
[myLbl setMinimumScaleFactor:MIN_FONT_SIZE/[UIFont labelFontSize]];

//Scale factor
[myLbl setMinimumScaleFactor:0.4];

Answer 2

This didn't work for me, but this did. You also need to use the system font in IB

#import <UIKit/UIKit.h>

@interface UILabelEx : UILabel


@end

#import "UILabelEx.h"
#import "Constants.h"

@implementation UILabelEx

- (void) traitCollectionDidChange: (UITraitCollection *) previousTraitCollection {
    [super traitCollectionDidChange: previousTraitCollection];

    self.font = [UIFont fontWithName:APP_FONT size:self.font.pointSize];   
}
@end