UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"请选择背景图片的来源"
                                                         delegate:self
                                                cancelButtonTitle:@"取消"
                                           destructiveButtonTitle:nil
                                                otherButtonTitles:@"拍照",@"相册",@"图片库",nil];

actionSheet.actionSheetStyle = UIActionSheetStyleDefault;
[actionSheet showInView: self.view];