![UILabel顶端对齐 UILabel顶端对齐](https://image.shishitao.com:8440/aHR0cHM6Ly9ia3FzaW1nLmlrYWZhbi5jb20vdXBsb2FkL2NoYXRncHQtcy5wbmc%2FIQ%3D%3D.png?!?w=700&webp=1)
比较一劳永逸的写法是对label添加一个分类
@interface UILabel (VerticalAlign)
/** 顶端对齐 */
-(void)alignTop;
/** 底部对齐 */
-(void)alignBottom;
@end
-(void)alignTop{
CGSize fontSize = [self.text sizeWithAttributes:@{NSFontAttributeName:self.font}];
double finalHeight = fontSize.height * self.numberOfLines;
double finalWidth = self.frame.size.width;
CGSize theStringSize = [self.text boundingRectWithSize:CGSizeMake(finalWidth, finalHeight)
options:NSStringDrawingUsesLineFragmentOrigin
attributes:@{NSFontAttributeName:self.font}
context:nil].size;
int newLinesToPad = (finalHeight - theStringSize.height) / fontSize.height;
for(int i=; i<newLinesToPad; i++){
self.text = [self.text stringByAppendingString:@"\n "];
}
}
-(void)alignBottom{
CGSize fontSize = [self.text sizeWithAttributes:@{NSFontAttributeName:self.font}];
double finalHeight = fontSize.height * self.numberOfLines;
double finalWidth = self.frame.size.width;
CGSize theStringSize = [self.text boundingRectWithSize:CGSizeMake(finalWidth, finalHeight)
options:NSStringDrawingUsesLineFragmentOrigin
attributes:@{NSFontAttributeName:self.font}
context:nil].size;
int newLinesToPad = (finalHeight - theStringSize.height) / fontSize.height;
for(int i=; i<newLinesToPad; i++){
self.text = [NSString stringWithFormat:@" \n%@",self.text];
}
}
然后在使用时添加[myLabel alignTop]即可。
添加前
使用后