本篇文章介紹了iOS開發中的手勢操作詳細介紹，下面小編給大家介紹詳細的解決步驟
手勢操作---識別單擊還是雙擊
在視圖上同時識別單擊手勢和雙擊手勢的問題在于，當檢測到一個單擊操作時，無法確定是確實是一個單擊操作或者只是雙擊操作中的第一次點擊。解決這個問題的方法就是:在檢測到單擊時，需要等一段時間等待第二次點擊，如果沒有第二次點擊，則為單擊操作；如果有第二次點擊，則為雙擊操作。
檢測手勢有兩種方法，一種是定制子視圖，重寫視圖從UIResponder類中繼承來的事件處理方法,即touchesBegan:withEvent:等一系列方法來檢測手勢；另一個方法是使用手勢識別器，即UIGestureRecognizer的各種具體子類。
一.重寫事件處理方法
?
?
- (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];?
??? //...?
}?
?
首先確認定制視圖的userInteractionEnabled和multipleTouchEnabled屬性都為YES.
在touchesEnded:withEvent:方法中，如果是第一次觸摸結束，則cancelPreviousPerformRequestsWithTarget:方法不會起作用，因為self未調度任何方法，此時tapCount為1，使用performSelector:withObject:afterDelay:調用單擊事件處理方法，在0.3s鐘后執行。
[self performSelector:@selector(handleSingleTap:) withObject:[NSValue valueWithCGPoint:touchPoint] afterDelay:0.3];
?
?
如果這是一個單擊操作，則后面0.3鐘內不會再有觸摸事件，則handleSingleTap:方法執行，這樣識別出了單擊操作。
如果這是一個雙擊操作，則第二次點擊在0.3s內觸發，在第二次觸摸操作的touchesEnded:withEvent:方法中，cancelPreviousPerformRequestsWithTarget:首先會取消之前對handleSingleTap:方法的調度，使之不會執行，然后在調用handleDoubleTap:方法處理雙擊操作。
二.使用Gesture Recognizer
使用Gesture Recognizer識別就會簡單許多，只需添加兩個手勢識別器，分別檢測單擊和雙擊事件，設置必要的屬性即可。
?
?
?
- (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];?
??? //...?
}?
?
唯一需要注意的是
?
[singleTapGesture requireGestureRecognizerToFail:doubleTapGesture];?
這句話的意思時，只有當doubleTapGesture識別失敗的時候(即識別出這不是雙擊操作)，singleTapGesture才能開始識別，同我們一開始講的是同一個問題。
?
UIGestureRecognizer小應用
1、輕拍手勢：雙指、單擊，修改imageView的frame為(0,0,320,200)
2、長按手指：單指，修改imageView的alpha=0.5
3、實現平移、旋轉、捏合
4、輕掃：豎向輕掃實現圖：像隨機切換顯示；橫向輕掃實現：圖像消失，隨機修改imageview的背景顏色
5、imageview每次只能添加一種手勢識別器。
?
#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,水平滑動是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 - 設置圖像?
- (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 = CGAffineTransformTranslate(self.imageView.transform, txty.x, txty.y);?
?????
??? [panGesture setTranslation:CGPointMake(0, 0) inView:self.view];?
?????
}?
?
#pragma mark 旋轉手勢?
- (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 = CGAffineTransformRotate(self.imageView.transform, rotateGesture.rotation);?
??? rotateGesture.rotation = 0;?
?????
}?
?
#pragma mark 捏合縮放手勢?
- (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 = CGAffineTransformScale(self.imageView.transform, pinchGesture.scale, pinchGesture.scale);?
??? pinchGesture.scale = 1;?
?????
}?
?
#pragma mark - 輕掃手勢?
#pragma mark 上下 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 水平 左右輕掃?
- (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",@"旋轉",@"捏合",@"輕掃"];?
?????
??? for (int i = 0; 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 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?
以上就是iOS開發中的手勢操作詳細介紹的全部內容介紹了，希望小編整理的相關知識和資料都對你們有所幫助，更多內容請繼續關注武林技術頻道網站！
