休息时内容不正确的UIScrollview（-20 px，而不是0px）

Question

我有一个UIScrollview，它在y轴上展开并调用这个委托方法：

-(void)scrollViewDidScroll:(UIScrollView *)scrollView {

    float yOff = scrollView.contentOffset.y;
    NSLog(@"y off is %f", yOff);
}

当scrollView移动到顶部（即yOff == 0）时，它实际上在大多数手机上休息为-20px，在iPhoneX上为-44px。如何关闭此行为，这样做有什么风险？

Answer 1

尝试在contentInsetAdjustmentBehavior上设置UIScrollView至.never

if (@available(iOS 11.0, *)) {
    scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
}

Answer 2

试试这个：

#define IPHONE4 (( [ [ UIScreen mainScreen ] bounds ].size.height == 480 ) ? 1 :0)
#define IPHONE5 (( [ [ UIScreen mainScreen ] bounds ].size.height == 568 ) ? 1 :0)
#define IPHONE6 (( [ [ UIScreen mainScreen ] bounds ].size.height == 667 ) ? 1 :0)
#define IPHONE6p (( [ [ UIScreen mainScreen ] bounds ].size.height == 736 ) ? 1 :0)
#define IPHONEX (( [ [ UIScreen mainScreen ] bounds ].size.height == 812 ) ? 1 :0)


-(void)scrollViewDidScroll:(UIScrollView *)scrollView {


    if (IPHONEX) {
        scrollView.contentOffset = CGPointMake(0,44);

    }else{
        scrollView.contentOffset = CGPointMake(0,20);
    }

}