Why is UIScrollView leaving space on top and does

问题:

I am new to objective-C programming.

I am using UIScrollView with some labels, image and text view on it.

I have turned off Autolayout and already tried with "Adjust scroll View Insets" on (situation described in title) and off (doesn't scroll).

This is what I insert into viewDidLoad:

    [scroller setScrollEnabled:YES];
[scroller setContentSize:CGSizeMake(320, 687)];

But I must be missing something very simple.

回答1:

1... Why is UIScrollView leaving space on top

With Storyboard- Goto view controller > Attribute Inspector > Uncheck Adjust Scroll View Insets property

With Code- For extra space set viewController property automaticallyAdjustsScrollViewInsets to NO, by default it is YES.

self.automaticallyAdjustsScrollViewInsets = false; 
scroller.contentInset = UIEdgeInsetsZero;
scroller.scrollIndicatorInsets = UIEdgeInsetsZero;
scroller.contentOffset = CGPointMake(0.0, 0.0);

2... does not scroll to the bottom

To make it scroll try with large number in contentSize like CGSizeMake(320, 1687). If it works that means you are not setting the contentSize large enough to have all its content.

回答2:

Just select your view controller and set shown option to false (uncheck)

回答3:

iOS 11

In my case only changing this UIScrollView Content Insets property in IB from Automatic to Never helped.

回答4:

iOS 11

if #available(iOS 11.0, *) {
    scrollView.contentInsetAdjustmentBehavior = .never
} else {
    automaticallyAdjustsScrollViewInsets = false
}

回答5:

Swift 3.0

self.automaticallyAdjustsScrollViewInsets = false

scrollView.contentInset = UIEdgeInsets.zero

scrollView.scrollIndicatorInsets = UIEdgeInsets.zero;     

回答6:

On iPhoneX this will also occur due to some non-sense safe area stuff that auto-layout tried to account for. Fix (for iPhoneX) with this:

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

回答7:

In your view .m file, use this code to fix this problem

-(void)layoutSubviews{
    // To fix iOS8 bug of scrollView autolayout
    if([[[[[UIDevice currentDevice]systemVersion] componentsSeparatedByString:@"."]objectAtIndex:0] integerValue] == 8){
        [self.tableView setContentInset:UIEdgeInsetsMake(0, 0, 0, 0)];
    }
}

回答8:

Swift 3.0

self.automaticallyAdjustsScrollViewInsets = false

scrollView.contentInset = UIEdgeInsets.zero

scrollView.scrollIndicatorInsets = UIEdgeInsets.zero;    

scrollView.contentOffset = CGPoint(x: 0.0, y: 0.0);

回答9:

Swift 3 (Auto Layout)

1. Change "Layout Margins" to explicit
2. Set margins to your needs

回答10:

Actually, the margin has nothing to do with ScrollViewInsets or contentOffset. It's just a conflict between SuperView.Top and SafeArea.Top pinning, happens when you pin the UIScrollView to top, bottom, left and right.

This is the right way to cover the top margin.

1) Pin all the four sides.

2) Select the top constraint > Change Second Item to Superview.Top

3) Then the last step is to change the Constant to 0 (Zero).

You might want to check this too: https://github.com/29satnam/MoveTextFieldWhenKeyboardAppearsSwift