- (void)showUploadSheet {
    UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"上傳" message:@"選擇圖片的方式" preferredStyle:UIAlertControllerStyleActionSheet];
    [alertVC addAction:[UIAlertAction actionWithTitle:@"相冊" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        UIImagePickerController *pickVC = [[UIImagePickerController alloc] init];
        pickVC.delegate = self;
        pickVC.allowsEditing = YES;
        pickVC.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentViewController:pickVC animated:YES completion:nil];
    }]];
    [alertVC addAction:[UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
    }]];
    [alertVC addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        
    }]];
    [self presentViewController:alertVC animated:YES completion:nil];
}

上面的關(guān)鍵在于 pickVC.allowsEditing = YES; 這個(gè)屬性
這個(gè)屬性表示選了圖片以后支持拖動圖片，選擇裁剪范圍

IMG_3377.PNG

同時(shí)要注意的是，選擇完以后一定要Dismiss掉PickerViewController，否則界面會卡住不能操作。
猜測是由于點(diǎn)擊Choose選擇以后，系統(tǒng)自動調(diào)取了編輯頁面的popViewControllerAnimated:方法，（從動畫可以看出，編輯頁面就是通過push的方式壓入棧內(nèi)的），但是編輯頁VC的nav應(yīng)該是由PickerViewController的上一個(gè)VC傳遞過來的，所以如果PickerViewController沒有Dismiss掉，那就會導(dǎo)致界面卡在編輯頁面

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