摘要：UIBlurEffect * b = [UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight]; UIVisualEffectView * v = [[UIVisualEffectView alloc]initWithEffect:b]; 阅读全文

摘要：NSString * str = @"abcdefg"; NSMutableString * string = [[NSMutableString alloc]initWithCapacity:str.length]; int j = (int)str.length; for (int i = j 阅读全文

摘要：创建uilabel的分类 //竖着显示 .h写入 @property (nonatomic) NSString *verticalText; .m写入 - (NSString *)verticalText{ // 利用runtime添加属性 return objc_getAssociatedObje 阅读全文