使用scrollView的一个子视图对contentSize进行调整

_scroll_Bg = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 100, SCREEN_W, 200)]; _scroll_Bg.pagingEnabled = YES; _scroll_Bg.delegate = self; _scroll_Bg.backgroundColor = [UIColor redColor]; [self.view addSubview:_scroll_Bg];

1，现在scrollView添加一个主要子视图，大小贴合scrollView

UIView *bgView = [[UIView alloc] init]; bgView.backgroundColor = [UIColor blueColor]; [_scroll_Bg addSubview:bgView]; [bgView mas_makeConstraints:^(MASConstraintMaker *make) { make.top.left.bottom.and.right.equalTo(_scroll_Bg).with.insets(UIEdgeInsetsZero); make.width.equalTo(_scroll_Bg); }];

2，此后所有子视图都需添加在此bgView上

UIView *childV = [[UIView alloc] init]; childV.backgroundColor = [UIColor cyanColor]; [bgView addSubview:childV]; [childV mas_makeConstraints:^(MASConstraintMaker *make) { make.left.right.mas_equalTo(0); make.top.mas_equalTo(250); make.height.mas_equalTo(1000); }];

3，以最后所加子视图为准，再对bgView进行重新约束

[bgView mas_makeConstraints:^(MASConstraintMaker *make) { make.bottom.equalTo(childV.mas_bottom); }];

以上就是本次给大家整理的全部内容，如果还有任何不明白的地方可以在下方的留言区讨论，感谢你对的支持。