#Extension 常用类的扩展

 手势block

#用法 [self.view addGestureRecognizer:[UITapGestureRecognizer JJX_gestureRecognizerWithActionBlock:^(id gestureRecognizer) {

NSLog(@"执行点击手势操作"); }]];

#相机,相册使用block

UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; [picker showToViewController:self completeBlock:^(UIImagePickerController *picker, NSDictionary *info) { NSLog(@"选择照片或者照相后回调"); [picker dismissViewControllerAnimated:YES completion:nil]; } cancelBlock:^(UIImagePickerController *picker) { [picker dismissViewControllerAnimated:YES completion:nil];

}];

#UIAlertController block