presentingViewController：

UIViewController *vc = [UIViewController new];
[self presentViewController:vc animated:YES completion:nil];

presentedViewController：

- (instancetype)init {
    self = [super init];
    if (self) {
        self.modalPresentationStyle = UIModalPresentationCustom;//采用自定義呈現(xiàn)方式
        self.modalTransitionStyle = UIModalTransitionStyleCoverVertical;//采用從低往上動(dòng)態(tài)覆蓋的方式轉(zhuǎn)場
    }
    return self;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor colorWithWhite:0 alpha:0.4];//設(shè)置透明度
}