iOS UILabel 文字自动左上角对齐

iOS中默认的UILabel是垂直居中对齐的，如果UILabel设置的高度较大，当内容少的时候，会自动垂直居中。

创建一个 UILabel的category

代码如下：

#import

@interface UILabel (LeftTopAlign)

- (void) textLeftTopAlign;

@end

#import UILabel+LeftTopAlign.h

@implementation UILabel (LeftTopAlign)

- (void) textLeftTopAlign

{

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];

paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;

NSDictionary *attributes = @{NSFontAttributeName:[UIFont systemFontOfSize:12.f], NSParagraphStyleAttributeName:paragraphStyle.copy};

CGSize labelSize = [self.text boundingRectWithSize:CGSizeMake(207, 999) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size;

CGRect dateFrame =CGRectMake(2, 140, CGRectGetWidth(self.frame)-5, labelSize.height);

self.frame = dateFrame;

}

@end

在需要的时候，只需要直接调用即可。

#import UILabel+LeftTopAlign.h

-(void)someMethod:(UILabel*)label

{

[label textLeftTopAlign];

}