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iOS開辟中的幾個手勢操作實例分享

編輯：IOS開發綜合

手勢操作---辨認單擊照樣雙擊
在視圖上同時辨認單擊手勢和雙擊手勢的成績在於，當檢測到一個單擊操作時，沒法肯定是確切是一個單擊操作或許只是雙擊操作中的第一次點擊。處理這個成績的辦法就是:在檢測到單擊時，須要等一段時光期待第二次點擊，假如沒有第二次點擊，則為單擊操作；假如有第二次點擊，則為雙擊操作。
檢測手勢有兩種辦法，一種是定制子視圖，重寫視圖從UIResponder類中繼續來的事宜處置辦法,即touchesBegan:withEvent:等一系列辦法來檢測手勢；另外一個辦法是應用手勢辨認器，即UIGestureRecognizer的各類詳細子類。
一.重寫事宜處置辦法

- (id)init {
    if ((self = [super init])) {
        self.userInteractionEnabled = YES;
        self.multipleTouchEnabled = YES;
        // ...
    }
    return self;
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [NSObject cancelPreviousPerformRequestsWithtarget:self];
    UITouch *touch = [touches anyObject];
    CGPoint touchPoint = [touch locationInView:self];

    if (touch.tapCount == 1) {
        [self performSelector:@selector(handleSingleTap:) withObject:[NSValue valueWithCGPoint:touchPoint] afterDelay:0.3];
    }else if(touch.tapCount == 2)
    {
        [self handleDoubleTap:[NSValue valueWithCGPoint:touchPoint]];
    }
}

-(void)handleSingleTap:(NSValue*)pointValue
{
    CGPoint touchPoint = [pointValue CGPointValue];
    //...
}

-(void)handleDoubleTap:(NSValue*)pointValue
{
    CGPoint touchPoint = [pointValue CGPointValue];
    //...
}

起首確認定制視圖的userInteractionEnabled和multipleTouchEnabled屬性都為YES.
在touchesEnded:withEvent:辦法中，假如是第一次觸摸停止，則cancelPreviousPerformRequestsWithtarget:辦法不會起感化，由於self未調劑任何辦法，此時tapCount為1，應用performSelector:withObject:afterDelay:挪用單擊事宜處置辦法，在0.3s鐘後履行。
[self performSelector:@selector(handleSingleTap:) withObject:[NSValue valueWithCGPoint:touchPoint] afterDelay:0.3];

假如這是一個單擊操作，則前面0.3鐘內不會再有觸摸事宜，則handleSingleTap:辦法履行，如許辨認出了單擊操作。
假如這是一個雙擊操作，則第二次點擊在0.3s內觸發，在第二次觸摸操作的touchesEnded:withEvent:辦法中，cancelPreviousPerformRequestsWithtarget:起首會撤消之前對handleSingleTap:辦法的調劑，使之不會履行，然後在挪用handleDoubleTap:辦法處置雙擊操作。
二.應用Gesture Recognizer
應用Gesture Recognizer辨認就會簡略很多，只需添加兩個手勢辨認器，分離檢測單擊和雙擊事宜，設置需要的屬性便可。

- (id)init {
    if ((self = [super init])) {
    self.userInteractionEnabled = YES;
        UITapGestureRecognizer *singleTapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleSingleTap:)];
        singleTapGesture.numberOfTapsRequired = 1;
        singleTapGesture.numberOfTouchesRequired = 1;
        [self addGestureRecognizer:singleTapGesture];

        UITapGestureRecognizer *doubleTapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleDoubleTap:)];
        doubleTapGesture.numberOfTapsRequired = 2;
        doubleTapGesture.numberOfTouchesRequired = 1;
        [self addGestureRecognizer:doubleTapGesture];

        [singleTapGesture requireGestureRecognizerToFail:doubleTapGesture];
    }
    return self;
}
-(void)handleSingleTap:(UIGestureRecognizer *)sender{
    CGPoint touchPoint = [sender locationInView:self];
    //...
}
-(void)handleDoubleTap:(UIGestureRecognizer *)sender{
    CGPoint touchPoint = [sender locationInView:self];
    //...
}

獨一須要留意的是

[singleTapGesture requireGestureRecognizerToFail:doubleTapGesture];
這句話的意思時，只要當doubleTapGesture辨認掉敗的時刻(即辨認出這不是雙擊操作)，singleTapGesture能力開端辨認，同我們一開端講的是統一個成績。

UIGestureRecognizer小運用
1、輕鼓掌勢：雙指、單擊，修正imageView的frame為(0,0,320,200)
2、長按手指：單指，修正imageView的alpha=0.5
3、完成平移、扭轉、捏合
4、輕掃：豎向輕掃完成圖：像隨機切換顯示；橫向輕掃完成：圖象消逝，隨機修正imageview的配景色彩
5、imageview每次只能添加一種手勢辨認器。

#define _originalRect CGRectMake(10, 50, 300, 450)
#define _originalImageName @"h4.jpeg"

#import "HMTRootViewController.h"

@interface HMTRootViewController (){

    UITapGestureRecognizer       * _tapGesture;
    UILongPressGestureRecognizer * _longGesture;
    UIPanGestureRecognizer       * _panGesture;
    UIRotationGestureRecognizer * _rotateGesture;
    UIPinchGestureRecognizer     * _pinchGesture;
    UISwipeGestureRecognizer     * _verticalSwipeGesture;
    UISwipeGestureRecognizer     * _horizontanlSwipeGesture;
    BOOL isTopDownOfRightLeft;    // 垂直滑動是YES,程度滑動是NO

}

@property (nonatomic,retain) UIButton * button;
@property (nonatomic,retain) UIImageView * imageView;

@end

@implementation HMTRootViewController

- (void)dealloc{

    RELEASE_SAFELY(_imageView);
    RELEASE_SAFELY(_button);
    [super dealloc];

}

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

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

    [self createButtonView];
    [self createImageView];

}

#pragma mark - 設置圖象
- (void)createImageView{

    self.imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:_originalImageName]];
    _imageView.frame = CGRectMake(10, 50, 300, 450);
    _imageView.userInteractionEnabled = YES;
    [self.view addSubview:_imageView];
    [_imageView release];
}

#pragma mark - 設置手勢

#pragma mark 點擊手勢
- (void)createTapGestureRecognizer{


    _tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(TapGestureRecognizer:)];
    _tapGesture.numberOfTapsRequired = 1;
    _tapGesture.numberOfTouchesRequired = 2;
    [self.imageView addGestureRecognizer:_tapGesture];
    [_tapGesture release];

}

- (void)TapGestureRecognizer:(UITapGestureRecognizer *)tapGesture{

    self.imageView.frame = CGRectMake(0, 0, 320, 200);
    NSLog(@"%@",NSStringFromCGRect(self.imageView.frame));

}

#pragma mark 長按手勢
- (void)createLongGestureRecognizer{

    _longGesture = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longGestureRecognizer:)];
    _longGesture.numberOfTouchesRequired = 1;
    _longGesture.minimumPressDuration = 1.0;
    [self.imageView addGestureRecognizer:_longGesture];
    [_longGesture release];

}

- (void)longGestureRecognizer:(UILongPressGestureRecognizer *)longGesture{

    self.imageView.alpha = 0.5;
    NSLog(@"%s",__FUNCTION__);

}

#pragma mark 平移拖拽手勢
- (void)createPanGestureRecognizer{

    _panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGestureRecognizer:)];
    [self.imageView addGestureRecognizer:_panGesture];
    [_panGesture release];

}

- (void)panGestureRecognizer:(UIPanGestureRecognizer *)panGesture{

    NSLog(@"%s",__FUNCTION__);

    CGPoint txty = [panGesture translationInView:self.view];
    self.imageView.transform = CGAff.netransformTranslate(self.imageView.transform, txty.x, txty.y);

    [panGesture setTranslation:CGPointMake(0, 0) inView:self.view];

}

#pragma mark 扭轉手勢
- (void)createRotationGestureRecognizer{


    _rotateGesture = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationGestureRecognizer:)];
    [self.imageView addGestureRecognizer:_rotateGesture];
    [_rotateGesture release];

}

- (void)rotationGestureRecognizer:(UIRotationGestureRecognizer *)rotateGesture{

    NSLog(@"%s",__FUNCTION__);
    self.imageView.transform = CGAff.netransformRotate(self.imageView.transform, rotateGesture.rotation);
    rotateGesture.rotation = 0;

}

#pragma mark 捏合縮撒手勢
- (void)createPinchGestureRecognizer{

    _pinchGesture = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchGestureRecognizer:)];
    [self.imageView addGestureRecognizer:_pinchGesture];
    [_pinchGesture release];

}

- (void)pinchGestureRecognizer:(UIPinchGestureRecognizer *)pinchGesture{

    NSLog(@"%s",__FUNCTION__);
    self.imageView.transform = CGAff.netransformScale(self.imageView.transform, pinchGesture.scale, pinchGesture.scale);
    pinchGesture.scale = 1;

}

#pragma mark - 輕掃手勢
#pragma mark 高低豎垂直輕掃
- (void)createVerticalSwipeGestureRecognizer{

    _verticalSwipeGesture = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeGestureRecognizer:)];
    _verticalSwipeGesture.direction = UISwipeGestureRecognizerDirectionUp | UISwipeGestureRecognizerDirectionDown;
    [self.imageView addGestureRecognizer:_verticalSwipeGesture];
    [_verticalSwipeGesture release];
}

#pragma mark 程度閣下輕掃
- (void)createHorizontanlSwipeGesture{

    _horizontanlSwipeGesture = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeGestureRecognizer:)];
    _horizontanlSwipeGesture.direction = UISwipeGestureRecognizerDirectionLeft |UISwipeGestureRecognizerDirectionRight;
    [self.imageView addGestureRecognizer:_horizontanlSwipeGesture];

}

- (void)swipeGestureRecognizer:(UISwipeGestureRecognizer *)swipeGesture{

    NSLog(@"%s",__FUNCTION__);

    if (swipeGesture.direction == (UISwipeGestureRecognizerDirectionUp|UISwipeGestureRecognizerDirectionDown)) {
        self.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"h%i.jpeg",arc4random()%7+1]];
        ;

    }else if (swipeGesture.direction == (UISwipeGestureRecognizerDirectionLeft|UISwipeGestureRecognizerDirectionRight)){

        self.imageView.image = nil;
        self.imageView.backgroundColor = [UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1.0];
    }
}

#pragma mark - 設置按鈕
- (void)createButtonView{

    NSArray * buttonArray = @[@"輕點",@"長按",@"平移",@"扭轉",@"捏合",@"輕掃"];

    for (int i = 0; i < [buttonArray count]; i++) {

        self.button = [UIButton buttonWithType:UIButtonTypeSystem];
        _button.frame = CGRectMake(10+50*i, 500, 50, 48);
        [_button setTitle:[buttonArray objectAtIndex:i] forState:UIControlStateNormal];
        [_button addTarget:self action:@selector(onClikButton:) forControlEvents:UIControlEventTouchUpInside];
        _button.tag = i;
        [self.view addSubview:_button];
    }

}

- (void)onClikButton:(UIButton *)button{

    [self resetImageView];
    switch (button.tag) {
        case 0:

            [self createTapGestureRecognizer];
            break;
        case 1:

            [self createLongGestureRecognizer];
            break;
        case 2:

            [self createPanGestureRecognizer];
            break;
        case 3:

            [self createRotationGestureRecognizer];
            break;
        case 4:

            [self createPinchGestureRecognizer];
            break;
        case 5:
            if (isTopDownOfRightLeft == YES) {
                [self createVerticalSwipeGestureRecognizer];
                isTopDownOfRightLeft = NO;
            } else {
                [self createHorizontanlSwipeGesture];
                isTopDownOfRightLeft = YES;
            }
            break;
        default:
            break;
    }

}

#pragma mark - 重置imageView
- (void)resetImageView
{
    for (int i = 0; i < [self.imageView.gestureRecognizers count]; i++) {
        [self.imageView removeGestureRecognizer:[self.imageView.gestureRecognizers objectAtIndex:i]];
    }
    self.imageView.alpha = 1.0;
    self.imageView.transform = CGAffineTransformIdentity;
    self.imageView.frame = _originalRect;
    self.imageView.image = [UIImage imageNamed:_originalImageName];
}

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

@end

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