UILabel 自动适应宽度

#import <UIKit/UIKit.h>@interface AutoSizeLabel : UILabel@end#import "AutoSizeLabel.h"@implementation AutoSizeLabel- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code    }    return self;}-(id)initWithCoder:(NSCoder *)aDecoder{    self = [super initWithCoder:aDecoder];    if (self) {            }    return self;}-(void)setText:(NSString *)text{    [super setText:text];    CGSize textSize = [text sizeWithFont:self.font];    [self setWidth:textSize.width+2];}