問題描述

我有兩個視圖控制器.一個用于頁面控制的滾動視圖和一個用于詳細信息的滾動視圖(垂直滾動).

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

當我在 iPhone 上單擊狀態欄時，scrollToTop 不起作用，而在 iPad 中，scrollToTop 正在工作.

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

我確定 scrollView.scrollToTop 是 YES.因為我已經打印出來了.

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

誰知道是什么原因導致 iPhone 的 scrollToTop 不工作?

Anyone know what cause the iPhone scrollToTop not working?

謝謝

我嘗試調用 scrollView 委托.在 iPad 中，這個委托被稱為.- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView

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

在 iPhone 中它不被調用.我已經同時使用了contentScrollView.delegate = self;但是iphone不工作:(

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

嘗試子類化 UIWindow(不工作)

Try subclassing UIWindow (not working)

窗口.h

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

窗口.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

AppDelegate.h

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

AppDelegate.m

AppDelegate.m

@synthesize window = _window;

推薦答案

據我了解，您的屏幕上同時有 2 個 UIScrollView.

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

據我所見&有經驗的，在 iOS 4 上并排有 2 個 UIScrollView 會產生未定義的行為.其中一個滾動視圖可能會滾動，有時可能會滾動，有時兩者都不會.

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.

在 iOS 5 上，如果您并排有 2 個 UIScrollView，然后點擊狀態欄滾動到頂部"UIScrollView 右側在您的點擊下"

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"

我不知道這是如何工作的，但這是我的觀察.iOS 5 很智能??！

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

如果您的 UIScrollViews 高于其他，則可能行為未定義.我沒查過.

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

希望這會有所幫助.

如果你想讓它正常工作，那么這里有一個可能的解決方案.

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

子類 或在 UIWindow 上添加一個類別并添加一個手勢識別器/或實現僅檢測 Y <的點擊的 hitTest20 以此類推，然后讓它發送通知并在您的 viewController 中收聽，并以編程方式將 UIScrollView 滾動到頂部.

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.

編輯

在 UIWindow 子類 (iPad) 中實現它

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];
}

這篇關于scrollToTop 在 iPhone 上不工作，但在 iPad 上工作的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！