滑动手势视图控制器 Xcode 5.1.1答案

【问题标题】：Swipe Gesture View Controller Xcode 5.1.1滑动手势视图控制器 Xcode 5.1.1
【发布时间】：2014-06-30 22:58:21
【问题描述】：

我是 Objective-C 和 Xcode 的新手，我很难更改视图。我知道您可以使用UIScrollView 在图像视图之间滑动，但我想简单地向右滑动以更改视图，然后向左滑动以返回。我有 AppDelegate.h 和 AppDelegate.m 没有更改。 ViewController.h 和 ViewController.m 如下：

ViewController.h：

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
@end

ViewController.m：

#import "ViewController.h"
#import "ViewController2.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    //sets up gesture recognizer
    UISwipeGestureRecognizer *swipeRightGesture=[[UISwipeGestureRecognizer alloc]               initWithTarget:self action:@selector(handleSwipeGesture:)];
    [self.view addGestureRecognizer:swipeRightGesture];
    swipeRightGesture.direction=UISwipeGestureRecognizerDirectionRight;
}

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

- (IBAction)handleSwipeGesture:(UISwipeGestureRecognizer *)sender 
{
    NSUInteger touches = sender.numberOfTouches;
    if (touches == 2)
    {
        if (sender.state == UIGestureRecognizerStateEnded)
        {
            ViewController2 *vc2 = [[ViewController2 alloc] initWithNibName:@"ViewController2" bundle:nil];
            [self.navigationController pushViewController:vc2 animated:YES];
        }
    }
}

@end

我还有ViewController2.h 和ViewController2.m，我已将它们链接到情节提要中的第二个视图以及我已链接到上述handleSwipeGesture 方法的手势。

【问题讨论】：

你想用两根手指滑动吗？还是只用一根手指？

标签： ios objective-c xcode uigesturerecognizer viewcontroller

【解决方案1】：

- (void)viewDidLoad
{
    [super viewDidLoad];

    UISwipeGestureRecognizer *oneFingerSwipeLeft = [[UISwipeGestureRecognizer alloc]
                                                    initWithTarget:self
                                                    action:@selector(oneFingerSwipeLeft:)] ;
    [oneFingerSwipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
    [[self view] addGestureRecognizer:oneFingerSwipeLeft];
}

- (void)oneFingerSwipeLeft:(UITapGestureRecognizer *)recognizer
{
    NSLog(@"Swiped left");
  // Add your navigation Code Here
}

如果你想使用单指滑动，你可以使用它。如果你想添加两个手指滑动添加你的

NSUInteger touches = sender.numberOfTouches;
    if (touches == 2)
    {
        if (sender.state == UIGestureRecognizerStateEnded)
        {
        }
    }

(void)onefingerSwipeLeft 方法中的上述代码

【讨论】：

【解决方案2】：

- (IBAction)handleSwipeGesture:(UISwipeGestureRecognizer *)sender 不需要是 IBAction，因为它没有连接到 IBOutlet。它应该返回void。

此外，一旦手势已经被识别，您可以不检查触摸的次数，而是可以通过使用以下行来要求两次触摸以使其完全被识别：

swipeRightGesture.numberOfTouchesRequired = 2;

因此，-(void)handleSwipeGesture 方法不再需要带参数，因此您可以从声明手势识别器的行中删除冒号。

最终的代码可能如下所示：

UISwipeGestureRecognizer *swipeRightGesture=[[UISwipeGestureRecognizer alloc]               initWithTarget:self action:@selector(handleSwipeGesture)];
swipeRightGesture.direction=UISwipeGestureRecognizerDirectionRight;
swipeRightGesture.numberOfTouchesRequired = 2;
[self.view addGestureRecognizer:swipeRightGesture];

...
...

- (void)handleSwipeGesture {
    ViewController2 *vc2 = [[ViewController2 alloc] initWithNibName:@"ViewController2" bundle:nil];
    [self.navigationController pushViewController:vc2 animated:YES];
}

【讨论】：