UIImagePickerController 用法

//首选需要遵循协议
<UIImagePickerControllerDelegate,UINavigationControllerDelegate>

//如果是imageView的话， interactionEnabled必须设置为YES
self.headImageView.userInteractionEnabled = YES;
UITapGestureRecognizer * tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(respondToTapGesture:)];
[self.headImageView addGestureRecognizer:tapGesture];

//手势方法
-(void)respondToTapGesture:(UITapGestureRecognizer *)gestrue{

UIImagePickerController * imageController = [[UIImagePickerController alloc]init];
imageController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//数据源类型有三种
![UIImagePickerControllerSourceTypePhotoLibrary](http://img.blog.csdn.net/20160502162802766)

UIImagePickerControllerSourceTypeCamera
这种方式直接打开设备相机取图

![UIImagePickerControllerSourceTypeSavedPhotosAlbum
](http://img.blog.csdn.net/20160502163631270)

imageController.allowsEditing = YES; //设置可以编辑
imageController.delegate = self;//设定委托
[self presentViewController:imageController animated:YES completion:nil];
}

//UIImagePickerControllerDelegate 协议方法

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
UIImage *image = info[@"UIImagePickerControllerEditedImage"];
self.headImageView.image = image;
[self dismissViewControllerAnimated:YES completion:nil];
}