在Ios Simulator中重新启动应用程序时，swipeGestureRecognizer无法正常工作

问题描述：

Im正在使用SwipeGestureRecognizer。它按照我的预期工作，但是当我在模拟器中退出应用程序并再次运行它时，SwipeGestureRecognizer不再响应。如果我退出iOS模拟器后再次运行它，它可以工作。在Ios Simulator中重新启动应用程序时，swipeGestureRecognizer无法正常工作

这是我曾尝试：

#import <UIKit/UIKit.h> 

@interface swipeTestUI : UIViewController 
@property (strong, nonatomic) IBOutlet UIImageView *imageView; 

- (IBAction)mangeSwipeControl:(UIGestureRecognizer*)sender; 




@end

实现文件：

#import "swipeTestUI.h" 

@interface swipeTestUI() 

@end 

@implementation swipeTestUI 

@synthesize imageView; 
int listOfImages = 0; 

- (IBAction)mangeSwipeControl:(UIGestureRecognizer *)sender { 
    NSLog(@"swipe ok"); 
    NSArray *images=[[NSArray alloc]initWithObjects: 
         @"1.png", 
         @"2.png", 
         @"3.png", 
         @"4.png", 
         @"5.png", 
         @"5.png",nil]; 
    UISwipeGestureRecognizerDirection direction = [(UISwipeGestureRecognizer *) sender direction]; 
    switch (direction) { 
     case UISwipeGestureRecognizerDirectionLeft: 
      listOfImages++; 
      break; 
     case UISwipeGestureRecognizerDirectionRight: 
      listOfImages--; 
      break; 
     default: 
      break; 
    } 
    listOfImages = (listOfImages < 0) ? ([images count] -1):listOfImages % [images count]; 
    imageView.image = [UIImage imageNamed:[images objectAtIndex:listOfImages]]; 



} 





- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 

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



} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{ 

    return (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight); 
}

答

我觉得这是一款iOS模拟器问题。我修改了一下代码，我觉得它的效果更好

头文件是一样的，执行文件如下。

-(IBAction)manageSwipeControl:(UISwipeGestureRecognizer *)gesture { 

    NSArray *images=[[NSArray alloc]initWithObjects: 
        @"1.png", 
        @"2.png", 
        @"3.png", 
        @"4.png", 
        @"5.png", 
        @"6.png",nil]; 

    if (gesture.direction == UISwipeGestureRecognizerDirectionLeft) 
    { 
    listOfImages++; 
    } 
    else if (gesture.direction == UISwipeGestureRecognizerDirectionRight) 
    { 
     listOfImages--; 
    } 
    listOfImages = (listOfImages < 0) ? ([images count] -1):listOfImages % [images count]; 
    imageView.image = [UIImage imageNamed:[images objectAtIndex:listOfImages]]; 
    //[self.imageView removeGestureRecognizer:sender]; 


}

工程就像一个魅力。有趣的事情。当我在iOS模拟器中退出应用程序并重新打开它时。它仍然有效。如果我退出并从iOS模拟器内存中删除它 - 它不会。如果我直接从操作系统启动iOS模拟器，没问题。我可以退出并从内存中删除它，它仍然有效。

不过，这是一个有趣的方式来度过一个下雨的周末。希望这个信息对像我这样的其他新开发者有用。

在Ios Simulator中重新启动应用程序时，swipeGestureRecognizer无法正常工作

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