UILabel fix for autoresizing http://stackoverflow.com/q/24510596

gistfile1.txt

#import "UILabel+AutoResizeingFix.h"
#import <objc/runtime.h>

@implementation UILabel (AutoResizeingFix)

+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Class class = [self class];
        
        SEL originalSelector = @selector(setFrame:);
        SEL swizzledSelector = @selector(fix_setFrame:);
        
        Method originalMethod = class_getInstanceMethod(class, originalSelector);
        Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
        
        BOOL didAddMethod =
        class_addMethod(class,
                        originalSelector,
                        method_getImplementation(swizzledMethod),
                        method_getTypeEncoding(swizzledMethod));
        
        if (didAddMethod) {
            class_replaceMethod(class,
                                swizzledSelector,
                                method_getImplementation(originalMethod),
                                method_getTypeEncoding(originalMethod));
        } else {
            method_exchangeImplementations(originalMethod, swizzledMethod);
        }
        
        
        
        
        
        originalSelector = @selector(intrinsicContentSize);
        swizzledSelector = @selector(fix_intrinsicContentSize);
        
        originalMethod = class_getInstanceMethod(class, originalSelector);
        swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
        
        didAddMethod =
        class_addMethod(class,
                        originalSelector,
                        method_getImplementation(swizzledMethod),
                        method_getTypeEncoding(swizzledMethod));
        
        if (didAddMethod) {
            class_replaceMethod(class,
                                swizzledSelector,
                                method_getImplementation(originalMethod),
                                method_getTypeEncoding(originalMethod));
        } else {
            method_exchangeImplementations(originalMethod, swizzledMethod);
        }
    });
}

#pragma mark - Method Swizzling

-(void)fix_setFrame:(CGRect)frame{
    [self fix_setFrame:frame];
    if (self.numberOfLines == 0) {
        
        // If this is a multiline label, need to make sure
        // `preferredMaxLayoutWidth`always matches the frame width
        // (i.e. orientation change can mess this up)
        
        if (self.preferredMaxLayoutWidth != frame.size.width) {
            self.preferredMaxLayoutWidth = frame.size.width;
            [self setNeedsUpdateConstraints];
        }
    }

}
- (CGSize)fix_intrinsicContentSize{
    CGSize size = [self fix_intrinsicContentSize];
    
    if (self.numberOfLines == 0) {
        
        // There's a bug where intrinsic content size
        // may be 1 point too short
        
        size.height += 1;
    }
    
    return size;

}

@end

UILabel+AutoResizeingFix.h

#import <UIKit/UIKit.h>

@interface UILabel (AutoResizeingFix)

@end