touchesMoved没有在iOS5中针对UIScrollView的iPhone进行触发 [英] touchesMoved not firing in iOS5 for the iPhone for UIScrollView

问题描述

我有一个带有ScrollView的iPhone应用程序需要响应触摸事件。

I have an iPhone app with a ScrollView which needs to respond to touch events.

为了支持滚动视图中的触摸事件，我需要将其基于捕获触摸事件并将其传递到主视图的自定义类。

In order to support touch events in the scrollview I needed to base it off a custom class which captured the touch events and passed them to the main view.

在4.3 iPhone模拟器中运行时，它按预期工作。使用NSLOG条目，我得到如下输出：

It works as expected when run in the 4.3 iPhone simulator. With the NSLOG entries I get output like this:

2011-10-17 09:28:06.782 SingleView[7000:b303] gameTable began
2011-10-17 09:28:06.784 SingleView[7000:b303] outside began
2011-10-17 09:28:09.976 SingleView[7000:b303] gameTable moved
2011-10-17 09:28:09.976 SingleView[7000:b303] outside moved
2011-10-17 09:28:09.977 SingleView[7000:b303] gameTable moved
2011-10-17 09:28:09.978 SingleView[7000:b303] outside moved
2011-10-17 09:28:10.019 SingleView[7000:b303] gameTable moved
2011-10-17 09:28:10.020 SingleView[7000:b303] outside moved
2011-10-17 09:28:10.046 SingleView[7000:b303] gameTable moved
2011-10-17 09:28:10.047 SingleView[7000:b303] outside moved
2011-10-17 09:28:10.077 SingleView[7000:b303] gameTable moved
2011-10-17 09:28:10.077 SingleView[7000:b303] outside moved
2011-10-17 09:28:10.143 SingleView[7000:b303] gameTable moved
2011-10-17 09:28:10.144 SingleView[7000:b303] outside moved
2011-10-17 09:28:12.433 SingleView[7000:b303] gameTable ended
2011-10-17 09:28:12.434 SingleView[7000:b303] outside ended

gameTable是自定义类中的事件，它只是将它传递给外部视图。

The gameTable is the event inside the custom class which just passes it to the outside view.

如果您在iOS 5 iPhone模拟器中运行相同的应用程序，您将获得如下输出：

If you run the same app in the iOS 5 iPhone simulator you get output like this:

2011-10-17 09:41:46.319 SingleView[7077:f803] gameTable began
2011-10-17 09:41:46.322 SingleView[7077:f803] outside began
2011-10-17 09:41:47.851 SingleView[7077:f803] gameTable moved
2011-10-17 09:41:47.852 SingleView[7077:f803] outside moved
2011-10-17 09:41:47.853 SingleView[7077:f803] gameTable moved
2011-10-17 09:41:47.860 SingleView[7077:f803] gameTable moved
2011-10-17 09:41:47.893 SingleView[7077:f803] gameTable moved
2011-10-17 09:41:47.916 SingleView[7077:f803] gameTable moved
2011-10-17 09:41:47.945 SingleView[7077:f803] gameTable moved
2011-10-17 09:41:48.009 SingleView[7077:f803] gameTable moved
2011-10-17 09:41:48.062 SingleView[7077:f803] gameTable moved

请注意，外部移动事件仅触发一次。

Notice the outside moved event only fires once.

这是代码。它是Xcode中的单个视图项目。

Here is the code. It's a single view project in Xcode.

//
//  XYZAppDelegate.h
//  SingleView
//

#import <UIKit/UIKit.h>

@class XYZViewController;

@interface XYZAppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@property (strong, nonatomic) XYZViewController *viewController;

@end



//
//  XYZAppDelegate.m
//  SingleView
//

#import "XYZAppDelegate.h"

#import "XYZViewController.h"

@implementation XYZAppDelegate

@synthesize window = _window;
@synthesize viewController = _viewController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.viewController = [[XYZViewController alloc] initWithNibName:@"XYZViewController" bundle:nil];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

@end


//
//  XYZViewController.h
//  SingleView
//

#import <UIKit/UIKit.h>
#import "GameTableScrollView.h"

@interface XYZViewController : UIViewController <UIScrollViewDelegate> {
    IBOutlet GameTableScrollView *outsideScrollView;

}

@property (nonatomic, retain) GameTableScrollView *outsideScrollView;

@end

    //
    //  XYZViewController.m
    //  SingleView
    //

    #import "XYZViewController.h"

    @implementation XYZViewController
    @synthesize outsideScrollView;

    #pragma mark - View lifecycle

    - (void)viewDidLoad
    {
        [super viewDidLoad];
        // Do any additional setup after loading the view, typically from a nib.

        [outsideScrollView setScrollEnabled:NO];
        [outsideScrollView setContentSize:CGSizeMake(480,555)];
    }


    // Handles the start of a touch
    -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
    {
        NSLog(@"outside began");
    }

    // Handles the continuation of a touch.
    -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
    {  
        NSLog(@"outside moved");
    }


    // Handles the end of a touch event.
    -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
    {
        NSLog(@"outside ended");
    }

    -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
    {
        NSLog(@"outside cancelled");
    }

    @end

    //
    //  GameTableScrollView.h
    //

    #import <UIKit/UIKit.h>

    @interface GameTableScrollView : UIScrollView <UIScrollViewDelegate> {

    }

    @end

//
//  GameTableScrollView.m
//

#import "GameTableScrollView.h"

@implementation GameTableScrollView

#pragma mark - Touch 

// Handles the start of a touch
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"gameTable began");
    if (!self.dragging) {
        [self.nextResponder touchesBegan:touches withEvent:event];
    }
    else [super touchesBegan:touches withEvent:event];
}


// Handles the continuation of a touch.
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{  
    NSLog(@"gameTable moved");
    if (!self.dragging) {
        [self.nextResponder touchesMoved:touches withEvent:event];
    }
    else [super touchesMoved:touches withEvent:event];
}


// Handles the end of a touch event.
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"gameTable ended");
    if (!self.dragging) {
        [self.nextResponder touchesEnded:touches withEvent:event];
    } 
    else [super touchesEnded:touches withEvent:event];
}

-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"gameTable cancelled");
    if (!self.dragging) {
        [self.nextResponder touchesCancelled:touches withEvent:event];
    } 
    else [super touchesCancelled:touches withEvent:event];
}

@end

推荐答案

我最近发布了回答类似的问题。

在 GameTableScrollView 你有这个代码：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"gameTable began");
    if (!self.dragging) {
        [self.nextResponder touchesBegan:touches withEvent:event];
    }
    else [super touchesBegan:touches withEvent:event];
}

要解决此问题，您需要更改此行：

And to fix the problem you need to change this line:

[self.nextResponder touchesBegan:touches withEvent:event];

对此：

[[self.nextResponder nextResponder] touchesBegan:touches withEvent:event];

这将导致 GameTableScrollView 通过触摸事件到外部视图。

This will cause the GameTableScrollView to pass the touch event to the outside view.

这篇关于touchesMoved没有在iOS5中针对UIScrollView的iPhone进行触发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！