使UILabel文字居上,文字顶部对齐

继承UI�Label，写一个TopLabel完成这个小功能

#import "TopLabel.h"

@implementation TopLabel

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/
- (void)drawTextInRect:(CGRect)rect {
    CGRect actualRect = [self textRectForBounds:rect
                         limitedToNumberOfLines:self.numberOfLines];
    [super drawTextInRect:actualRect];
}

@end