Iphone UIScrollView未正确滚动

这就是我到目前为止所拥有的，我有一个滚动条和两个按钮，我想在滚动条上，但我不能到达第二个按钮，因为它不会滚动到它。如果有人能看到我代码中的错误，我将不胜感激

    UIScrollView *mainScroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 65, 320, 4000)];
mainScroll.contentSize = CGSizeMake(320, 4000);
mainScroll.showsHorizontalScrollIndicator = YES;
[self.view addSubview:mainScroll];
[mainScroll setScrollEnabled:YES];


UIButton *mainCreateGame = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[mainCreateGame addTarget:self
                   action:@selector(goToCreateGameViewController)
         forControlEvents:UIControlEventTouchUpInside];
[mainScroll addSubview:mainCreateGame];
mainCreateGame.frame = CGRectMake(75, 10, 170, 60);



UIButton *anotherButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[anotherButton addTarget:self
                  action:@selector(goFuckOffApple)
        forControlEvents:UIControlEventTouchUpInside];
[mainScroll addSubview: anotherButton];
anotherButton.frame = CGRectMake(75, 3000, 170, 60);

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好吧，除了搞笑的方法名称（goF**kOffApple，LOL），您还将滚动视图的帧设置为与内容相同的大小。框架和内容大小是不同的。试试这个：

 UIScrollView *mainScroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 65, 320, 395)];
mainScroll.contentSize = CGSizeMake(320, 4000);
mainScroll.showsVerticalScrollIndicator = YES;
[self.view addSubview:mainScroll];
[mainScroll setScrollEnabled:YES];


UIButton *mainCreateGame = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[mainCreateGame addTarget:self
                   action:@selector(goToCreateGameViewController)
         forControlEvents:UIControlEventTouchUpInside];
[mainScroll addSubview:mainCreateGame];
mainCreateGame.frame = CGRectMake(75, 10, 170, 60);



UIButton *anotherButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[anotherButton addTarget:self
                  action:@selector(goFuckOffApple)
        forControlEvents:UIControlEventTouchUpInside];
[mainScroll addSubview: anotherButton];
anotherButton.frame = CGRectMake(75, 3000, 170, 60);

---

英雄联盟那时我有点生苹果的气。哈哈哈，谢谢你，伙计