ios - ScrollView 无法以编程方式工作

Question

开玩笑，我尝试以编程方式ScrollView。它在 ViewController.m 中运行良好我试过这样

scroll=[[UIScrollView alloc]init];
    scroll.frame=CGRectMake(0, 50, self.view.frame.size.width, self.view.frame.size.height);
    scroll.delegate=self;
    scroll.scrollEnabled=YES;
    scroll.contentSize =CGSizeMake(100, 525);
    scroll.backgroundColor=[UIColor yellowColor];
    [self.view addSubview:scroll];

    goo=[[UIButton alloc]init];
    goo.frame=CGRectMake(0, 50, 100, 100);
    goo.backgroundColor= [UIColor brownColor];
    [goo setTitle:@"good Day" forState:UIControlStateNormal];
    [goo addTarget:self action:@selector(ok:) forControlEvents:UIControlEventTouchDown];
    [scroll addSubview:goo];

工作不错，但相同的代码在 SecondViewControl 中不起作用

-(void)ok:(id)sender
{
     Second *second=[[Second alloc]initWithNibName:nil bundle:nil];
     [second setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
    [self presentViewController:second animated:YES completion:nil];

}

第二.m

scroll=[[UIScrollView alloc]init];
        scroll.frame=CGRectMake(0, 50, self.view.frame.size.width, self.view.frame.size.height);
        scroll.delegate=self;
        scroll.scrollEnabled=YES;
        scroll.contentSize =CGSizeMake(100, 525);
        scroll.backgroundColor=[UIColor yellowColor];
        [self.view addSubview:scroll];

我不明白为什么 scrollView 在 Second.m 中不起作用，但相同的代码在 ViewControl.m 中起作用。我的 Xcode 版本 6.0.1

Answer 1

请使用presentViewController代替modalViewController并将UIScrollView的Delegate设置为SecondViewController