无法调整 UIScrollView 的框架大小

Question

我有一个UIScrollView与它的框架和contentSize具有相同的大小。当键盘出现时，我想改变scrollView的帧高度，但它不起作用。如果我改变x或y的位置，一切正常，但如果我试图改变框架的宽度或高度，一切保持不变，什么也没有发生。

下面是我的代码:

-(void)resizeContentView:(BOOL)resize forOffset:(CGFloat)offset
{
    [UIView animateWithDuration:0.3f animations:^{
        UIView* resizeView = [self getResizingView];
        if ( !resizeView )
            return;
        CGRect rect = resizeView.frame;
        if (resize)
        {
            rect.size.height -= offset;
        }
        else
        {
            rect.size.height += offset;
        }
        resizeView.frame = rect;
    }];
}

我没有使用自动布局，无论我是否使用动画，都会出现同样的问题。

Answer 1

尝试更改content size对keyboaardDidAppear的通知。

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

-(void)keyboardWillShow:(NSNotification*) notif {
NSLog(@"-(void)keyboardWillShow");
[UIView animateWithDuration:2 animations:^{
    self.scrollview.frame = CGRectMake(0, 0, self.scrollview.frame.size.width/2, self.scrollview.frame.size.height/3
                                       );
} completion:^(BOOL finished) {
self.scrollview.backgroundColor = [UIColor redColor];
}];
}
-(void)keyboardWillHide:(NSNotification*) notif {
NSLog(@"-(void)keyboardWillHide");
    self.scrollview.backgroundColor = [UIColor greenColor];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
[textField resignFirstResponder];
return YES;
}