1:查看手机中安装的所有App的包名 (void)GetPackageName{Class lsawsc = NSClassFromString...

UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 200, ...

(void)setLabel{NSString *title = @"请竖向排列!!";UILabel *lable = [[UILabel a...

首先，我们需要知道何谓谓词，让我们看看官方的解释:The NSPredicate class is used to define logical...

UIImageJPEGRepresntation UIImageJPEGRepresentation方法在耗时上比较少 而UIImagePNGR...