imagePickerControllerDidCancel:
imagePickerController:didFinishPickingImage:editingInfo://Deprecated in iOS 3.0
NSString *const UIImagePickerControllerMediaType;// 媒体类型
NSString *const UIImagePickerControllerOriginalImage;// 原始未编辑的图像
NSString *const UIImagePickerControllerEditedImage;// 编辑后的图像
NSString *const UIImagePickerControllerCropRect;// 源图像可编辑(有效 )区域
NSString *const UIImagePickerControllerMediaURL;// 视频的路径
NSString *const UIImagePickerControllerReferenceURL;// 原始选择项的URL
NSString *const UIImagePickerControllerMediaMetadata;// 只有在使用摄像头并且是图像类型的时候有效.包含选择图像信息的字典类型
14. UIImagePickerController小例子
UIImagePickerController的代理需要遵守这两个协议.
#pragma mark 选择照片
- (void)selectPhoto
{
// 1. 首先判断照片源是否可用
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
// 0）实例化控制器
UIImagePickerController *picker = [[UIImagePickerController alloc]init];
// 1）设置照片源
[picker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
// 2) 设置允许修改
[picker setAllowsEditing:YES];
// 3) 设置代理
[picker setDelegate:self];
// 4) 显示控制器
[self presentViewController:picker animated:YES completion:nil];
} else {
NSLog(@"照片源不可用");
}
}
#pragma mark - imagePicker代理方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
UIImage *image = info[@"UIImagePickerControllerEditedImage"];
[_imageButton setImage:image forState:UIControlStateNormal];
// 关闭照片选择器
[self dismissViewControllerAnimated:YES completion:nil];
// 需要将照片保存至应用程序沙箱，由于涉及到数据存储，同时与界面无关
// 可以使用多线程来保存图像
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// 保存图像
// 1. 取图像路径
NSArray *docs = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *imagePath = [docs[0]stringByAppendingPathComponent:@"abc.png"];
// 2. 转换成NSData保存
NSData *imageData = UIImagePNGRepresentation(image);
[imageData writeToFile:imagePath atomically:YES];
});
}