scrollToTop无法在iPhone上运行，但它可以在iPad上运行 [英] scrollToTop is not working on iPhone but it is working on iPad

问题描述

我有两个视图控制器。一个用于页面控制的滚动视图和一个用于细节的滚动视图（滚动垂直）。

当我点击iPhone上的状态栏时，scrollToTop无效，而在iPad中，scrollToTop正在工作。 / p>

我确定scrollView.scrollToTop为YES。因为我已打印出来了。

有人知道是什么导致iPhone scrollToTop无法正常工作吗？

谢谢

p>

编辑：
我尝试调用scrollView委托。 iPad中的
这个委托叫它。
- （BOOL）scrollViewShouldScrollToTop :( UIScrollView *）scrollView

在iPhone中它没有被调用。
我已经使用
contentScrollView.delegate = self;
但iphone无法正常工作：（

编辑：尝试子类化UIWindow（不工作）

Window.h

  #import< UIKit / UIKit.h> 
 #import< Foundation / Foundation.h> ; 
 @interface窗口：UIWindow 
 @end 
  

Window.m

  #importWindow.h
 
 @implementation窗口
 
  - （ UIView *）hitTest：（CGPoint）指向withEvent：（UIEvent *）事件{
 if（[event type] == UIEventTypeTouches&& point.y< 250）{
 //发送你的通知在这里
 NSLog（@KAROOO）; 
} 
 NSLog（@HELLOWW）; 
返回[super hitTest：指向withEvent：event]; 
 } 
 @end 
  

AppDelegate.h

  @property（非原子，强）IBOutlet窗口*窗口; 
  

AppDelegate.m

  @synthesize window = _window; 
  

解决。案

据我了解，你同时有2个UIScrollViews在屏幕上

这是我所看到的和放;经验丰富，
在iOS 4上有2个UIScrollViews并排给出了未定义的行为。其中一个scrollview可以滚动，有时也可以滚动，有时也不滚动。

在iOS 5上，如果你有2个UIScrollView并排，那么点击状态栏滚动到顶部 UIScrollView正确在您的点击下

我不知道这是如何工作的，但这是我的观察。 iOS 5很聪明!!

如果您的UIScrollViews高于其他，那么可能行为未定义。我没有检查过。

希望这会有所帮助。

如果你想让它继续工作那么这里是一种可能的解决方案。

子类或在 UIWindow上添加一个类别，并添加一个手势识别器/或实现hitTest，检测仅针对Y< ; 20等等然后让它发送通知并在你的viewController中监听它并以编程方式将UIScrollView滚动到顶部。

编辑

在UIWindow子类（iPad）中实现它

   - （UIView *）hitTest：（CGPoint）指向withEvent：（UIEvent *）事件{
 if（[event type] == UIEventTypeTouches&& point.y< 20&& [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait）{
 NSLog（@Portrait）; 
} else if（[event type] == UIEventTypeTouches&& point.y> 1004&& [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortraitUpsideDown）{
 NSLog（@PortraitUpsideDown ）; 
}否则if（[event type] == UIEventTypeTouches&& point.x< 20&& [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeLeft）{
 NSLog（@LandscapeLeft ）; 
}否则if（[event type] == UIEventTypeTouches&& point.x> 748&& [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeRight）{
 NSLog（@LandscapeRight ）; 
} 
 return [super hitTest：point withEvent：event]; 
} 
  

I have two view controller. One scrollview for page control and one for detail (scroll vertical).

When i click status bar on iPhone the scrollToTop not working, and in iPad the scrollToTop is working.

I am sure that the scrollView.scrollToTop is YES. because i already print it.

Anyone know what cause the iPhone scrollToTop not working?

Thank you

Edit: I try by calling the scrollView delegate. in iPad this delegate its called. - (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView

in iPhone it is not called. I already use both contentScrollView.delegate = self; But the iphone not working :(

Edit: Try subclassing UIWindow (not working)

Window.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
@interface Window : UIWindow
@end

Window.m

 #import "Window.h"

 @implementation Window

 - (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
if ([event type] == UIEventTypeTouches && point.y < 250) {
    //Send Your Notification Here
    NSLog(@"KAROOO");
}
NSLog(@"HELLOWW");
return [super hitTest:point withEvent:event];
}
@end

AppDelegate.h

@property (nonatomic, strong) IBOutlet Window *window;

AppDelegate.m

@synthesize window = _window;

解决方案

From what I understand you have 2 UIScrollViews simultaneously on screen.

From what I have seen & experienced, On iOS 4 having 2 UIScrollViews side by side gives undefined behaviour. One of the scrollview may scroll, sometimes other, sometimes neither.

On iOS 5 if you have 2 UIScrollViews side by side then tapping on status bar "scrolls to top" the UIScrollView right "under your tap"

I don't know how this works, but this has been my observation. iOS 5 is smart !!

If your UIScrollViews are one above other then probably the behaviour is undefined. I haven't checked.

Hope this helps.

If you want to get it working anyways then here is a possible solution.

Subclass or Add a category on UIWindow and add a gesture recognizer / or implement hitTest that detects tap only for Y < 20 and so on and then have it send a notification and listen to this in your viewController and programmatically scroll the UIScrollView to top.

EDIT

Implement this in the UIWindow subclass (iPad)

- (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    if ([event type] == UIEventTypeTouches && point.y < 20 && [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait) {
        NSLog(@"Portrait");
    } else if ([event type] == UIEventTypeTouches && point.y > 1004 && [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortraitUpsideDown) {
        NSLog(@"PortraitUpsideDown");
    } else if ([event type] == UIEventTypeTouches && point.x < 20 && [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeLeft) {
        NSLog(@"LandscapeLeft");
    } else if ([event type] == UIEventTypeTouches && point.x > 748 && [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeRight) {
        NSLog(@"LandscapeRight");
    }
    return [super hitTest:point withEvent:event];
}

这篇关于scrollToTop无法在iPhone上运行，但它可以在iPad上运行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！