iPhone之手势切换图片

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原创最新推荐文章于 2026-06-14 09:16:10 发布 4.5k 阅读 AI 写同款· GEO 优化 ›

4、解锁 iPhone 使用新体验：从交互手势到电源管理全攻略本文全面介绍了iPhone的交互手势、传感器功能及电源管理技巧，涵盖从基础操作到高级设置的实用指南。通过详细解析点击、滑动、捏合等手势的应用场景，揭示接近传感器、加速度计、GPS等硬件的工作原理，并提供解锁、睡眠、关机、重启及恢复模式的操作方法。同时分享了优化电池续航、管理后台应用、处理常见问题的有效策略，帮助用户全面提升iPhone使用效率与体验。阅读详情

iPhone之手势切换图片

今天我们介绍一下iPhone手势切换图片，算是对之前的小小总结。程序功能和常用的图片浏览软件类似，手指向左划动就回卷到上一幅图片，向右划动就后卷到下一幅图片。别看功能简单，但真正实现起来还是挺麻烦的。下面开始吧：

新建一个Window-based Application，名称为Switch：

分别新建三个UIViewController：FirstViewController，SecondViewController 和 RootViewController，其中 FirstViewController，SecondViewController 需要勾选第三项“With XIB for user interface”，而 RootViewController 则不用勾选（这样做的原因是我想介绍一下手动创建一个XIB的过程）

下面介绍一下手动创建 RootViewController.XIB 并与RootViewController 关联的过程：

新建一个 Empty XIB，名称是 RootViewController.XIB：

打开 RootViewController.XIB，我们发现少了 View 一项：

从左侧的Library库中拖一个 View 到其中：

选中 File's Owner，按 Command ＋ 4 打开属性窗口，在 Class 一栏选择 RootViewController，这样新创建的 RootViewController.XIB 就和 RootViewController 联系起来了：

然后，选中 File's Owner，按 Ctrl 键，鼠标拖动到 View 中，在弹出的 Outlets 中选择 View，这样新创建的 View 就和 RootViewController 的 View 联系起来了：

修改 SwitchAppDelegate.m 如下：

//
//  SwitchAppDelegate.m
//  Switch
//
//  Created by HuTao on 8/18/12.
//  Copyright __MyCompanyName__ 2012. All rights reserved.
//

#import "SwitchAppDelegate.h"
#import "RootViewController.h"


@implementation SwitchAppDelegate


@synthesize window;


#pragma mark -
#pragma mark Application lifecycle


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{    
	// Override point for customization after application launch.
	RootViewController  * root = [[RootViewController alloc]init];
	window.rootViewController = root;
	[window makeKeyAndVisible];
	
	return YES;
}


- (void)dealloc
{
    [window release];
    [super dealloc];
}


@end

运行一下，发现已经成功了，可以在 RootViewController.XIB 放置些控件以示区别

将要显示的图片加入工程中，并且在 FirstViewController.XIB 和 SecondViewController.XIB 中分别铺满 UIImageView 控件，如下图：

修改 FirstViewController.h 如下：

//
//  FirstViewController.h
//  Switch
//
//  Created by HuTao on 8/18/12.
//  Copyright 2012 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>


@interface FirstViewController : UIViewController
{
	IBOutlet UIImageView * imageView;
}


@property (retain, nonatomic) UIImageView * imageView;


-(void)loadImage:(NSString *)imageName;


@end

loadImage是提供给外部调用的一个方法，传入要显示的文件名，就会在UIImageView中显示出来

并把 UIImageView 和对应的 IBOutlet 连接起来

然后修改 FirstViewController.m 如下：

//
//  FirstViewController.m
//  Switch
//
//  Created by HuTao on 8/18/12.
//  Copyright 2012 __MyCompanyName__. All rights reserved.
//

#import "FirstViewController.h"


@implementation FirstViewController


@synthesize imageView;



-(void)loadImage:(NSString *)imageName
{
	[imageView setImage:[UIImage imageNamed:imageName]];
}


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
	[super viewDidLoad];
}


- (void)viewDidUnload
{
	[super viewDidUnload];
	
	imageView = nil;
}


- (void)dealloc
{
	[super dealloc];
	
	[imageView release];
}


@end

[UIImageView setImage:UIImage] 显示图像

[UIImage imageNamed:NSString *] 将文件名转换成 UIImage

SecondViewController 完全参照 FirstViewController 的修改

修改 RootViewController.h 如下：

//
//  RootViewController.h
//  Switch
//
//  Created by HuTao on 8/18/12.
//  Copyright 2012 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>


@class FirstViewController;
@class SecondViewController;


@interface RootViewController : UIViewController
{
	FirstViewController * firstViewController;
	SecondViewController * secondViewController;
	
	//图片名称列表
	NSArray * imageNameList;
	
	//当前图片编号
	int imageIndex;
	
	//当前显示的是否是FirstViewController
	BOOL firstUpside;
}


@property (retain, nonatomic) FirstViewController * firstViewController;
@property (retain, nonatomic) SecondViewController * secondViewController;
@property (retain, nonatomic) NSArray * imageNameList;


-(void)handleSwipeGesture:(UIGestureRecognizer*)sender;
-(void)curlImage:(UISwipeGestureRecognizerDirection)direction;



@end

修改 RootViewController.m 如下：

//
//  RootViewController.m
//  Switch
//
//  Created by HuTao on 8/18/12.
//  Copyright 2012 __MyCompanyName__. All rights reserved.
//

#import "RootViewController.h"
#import "FirstViewController.h"
#import "SecondViewController.h"


@implementation RootViewController


@synthesize firstViewController;
@synthesize secondViewController;
@synthesize imageNameList;



//划动手势后调用的回调函数
-(void)handleSwipeGesture:(UIGestureRecognizer *)sender
{  
	//划动的方向
	UISwipeGestureRecognizerDirection direction = [(UISwipeGestureRecognizer *)sender direction];  
	
	//上卷或下卷图片
	[self curlImage:direction];
}  


-(void)curlImage:(UISwipeGestureRecognizerDirection)direction
{
	UIViewAnimationTransition transition; 

	//判断是上下左右  
	switch (direction)
	{  
		case UISwipeGestureRecognizerDirectionUp:  
			NSLog(@"up");
			return;
		case UISwipeGestureRecognizerDirectionDown:  
			NSLog(@"down");  
			return;
		case UISwipeGestureRecognizerDirectionLeft:
			//往左划动，表示向前翻页
			NSLog(@"left");  
			imageIndex = ( ([imageNameList count] - 1 + imageIndex) % [imageNameList count]);
			transition = UIViewAnimationTransitionCurlDown;
			break;  
		case UISwipeGestureRecognizerDirectionRight:
			//往右划动，表示向后翻页
			NSLog(@"right");  
			imageIndex = ( (++imageIndex) % [imageNameList count] );
			transition = UIViewAnimationTransitionCurlUp;
			break;  
		default:  
			return;  
	}
	
	
	//loadImage必须放在insertSubview之后，否则无效？为什么？
	UIViewController * coming = nil;	
	UIViewController * going = nil;	
	
	if(firstUpside == YES)	 
	{
		//由 FirstViewController 切换到 SecondViewController
		coming = secondViewController;	
		going = firstViewController;   
	}
	else	
	{	
		//由 SecondViewController 切换到 FirstViewController
		coming = firstViewController;	
		going = secondViewController;
	}
	
	[UIView beginAnimations:@"View Flip" context:nil];	
	[UIView setAnimationDuration:1.25];	
	[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; 

	[UIView setAnimationTransition:transition forView:self.view cache:YES];	
	
	[coming viewWillAppear:YES];	
	[going viewWillDisappear:YES];	
	
	[going.view removeFromSuperview];	
	[self.view insertSubview:coming.view atIndex:0];	
	
	
	if(firstUpside == YES)	 
	{
		[secondViewController loadImage:[imageNameList objectAtIndex:imageIndex]];
		firstUpside = NO;
	}
	else	
	{	
		[firstViewController loadImage:[imageNameList objectAtIndex:imageIndex]];
		firstUpside = YES;
	}
	
	
	[coming viewDidAppear:YES];	
	[going viewDidDisappear:YES];	
	
	//提交Animation  
	[UIView commitAnimations];	
}


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

	imageNameList = [[NSArray alloc] initWithObjects:
					 @"1.jpg", @"2.jpg", @"3.jpg", @"4.jpg",
					 @"5.jpg", @"6.jpg", @"7.jpg", @"8.jpg", nil];
	
	imageIndex = 0;
	
	firstUpside = YES;


	FirstViewController * temp1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];	
	self.firstViewController = temp1;
	//首先显示 FirstViewController
	[self.view insertSubview:temp1.view atIndex:0];
	[temp1 release];
	[firstViewController loadImage:[imageNameList objectAtIndex:imageIndex]];

	SecondViewController * temp2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];					
	self.secondViewController = temp2;	
	[temp2 release];	

	

	//划动手势  
	//上划  
	UISwipeGestureRecognizer * swipeGestureUp = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];  
	swipeGestureUp.direction = UISwipeGestureRecognizerDirectionUp;
	[self.view addGestureRecognizer:swipeGestureUp];  
	[swipeGestureUp release];  
	//下划  
	UISwipeGestureRecognizer * swipeGestureDown = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];  
	swipeGestureDown.direction = UISwipeGestureRecognizerDirectionDown;
	[self.view addGestureRecognizer:swipeGestureDown];  
	[swipeGestureDown release];  
	//左划  
	UISwipeGestureRecognizer * swipeGestureLeft = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];  
	swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft;
	[self.view addGestureRecognizer:swipeGestureLeft];  
	[swipeGestureLeft release];  
	//右划  
	UISwipeGestureRecognizer * swipeGestureRight = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];  
	swipeGestureRight.direction = UISwipeGestureRecognizerDirectionRight;
	[self.view addGestureRecognizer:swipeGestureRight];  
	[swipeGestureRight release];  
}


- (void)viewDidUnload
{
	[super viewDidUnload];

	firstViewController = nil;
	secondViewController = nil;
}


- (void)dealloc {
	[super dealloc];
	
	[firstViewController release];
	[secondViewController release];
}


@end

虽然代码较多，但很好理解。

首先初始化了 FirstViewController 和 SecondViewController，然后加入了GestureRecognizer，一旦识别到划动手势，则调用 handleSwipeGesture回调函数。

在 curlImage 中，我采用的切换图片的原理是：定义两个 UIViewController，交替显示，以此达到翻页切换图片的目的。当然，还需要考虑只有0或1张图的情况，不过，这里我省略了。

另外经过我的测试，发现 loadImage 必须放在 insertSubview 之后，否则无效？为什么？

运行结果如下：

原图：