iOS label文字竖着显示

1、先创建个UILabel的分类

2、创建属性@property (nonatomic) NSString *verticalText;

3、- (NSString *)verticalText{

// 利用runtime添加属性
return objc_getAssociatedObject(self, @selector(verticalText));

}

4、- (void)setVerticalText:(NSString *)verticalText {

objc_setAssociatedObject(self, &verticalText, verticalText, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
NSMutableString *str = [[NSMutableString alloc] initWithString:verticalText];
NSInteger count = str.length;
for (int i = 1; i < count; i ++) {
    [str insertString:@"\n" atIndex:i*2-1];
}
self.text = str;
self.numberOfLines = 0;

}

5、用法：label.verticalText = @"竖着";