从相册选取图片

//从相册选取
UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

UIImagePickerController*picker = [[UIImagePickerController alloc] init];

picker.delegate = self;

picker.allowsEditing = YES;

picker.sourceType = sourceType;

[self presentViewController:picker animated:YES completion:nil];