ViewController.h
//協議 - 實現多個手勢同時操作
<UIGestureRecognizerDelegate>
//定義視圖對象
UIImageView *_imageView;
//捏合手勢，可以對視圖放大縮小
UIPinchGestureRecognizer *_pinchGes;
//定義 旋轉手勢，旋轉圖片
UIRotationGestureRecognizer *_rotGes;
//平移 手勢
UIPanGestureRecognizer *_pan;
//長按 手勢
UISwipeGestureRecognizer *_swipe;
ViewController.m
//加載圖像對象，從本地加載到內存中
UIImage *image = [UIImage imageNamed:@"123"];
//創建圖像視圖
_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(34, 164, 306, 217)];
//將圖像視圖賦值
_imageView.image = image;
//按比例縮放。是啥樣就是啥樣，保持原來的樣子
// _imageView.contentMode = UIViewContentModeScaleAspectFit;
[self.view addSubview:_imageView];
//交互事件響應開關
//YES：可以交互，必須要設置
//NO：不能接收交互。默認是NO
_imageView.userInteractionEnabled = YES;
#pragma mark - 單擊放大
//創建點擊手勢對象 self:響應事件的擁有者，self表示當前視圖控制器 action: 響應事件的函數
UITapGestureRecognizer *tapOneGes = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapOneAct:)];
//點擊幾次，才會觸發 默認是1
tapOneGes.numberOfTapsRequired = 1;
//幾個手指，點擊觸發 默認是1
tapOneGes.numberOfTouchesRequired = 1;
//將點擊事件添加到視圖中，視圖即可響應事件
[_imageView addGestureRecognizer:tapOneGes];
//單擊放大響應函數
//參數手勢點擊事件對象
- (void)tapOneAct:(UITapGestureRecognizer *)tap
{
//隨機背景顏色
NSLog(@"放大");
// float randomR = arc4random_uniform(255)/255.0;
// float randomG = arc4random_uniform(255)/255.0;
// float randomB = arc4random_uniform(255)/255.0;
//
// UIColor *randomColor = [UIColor colorWithRed:randomR green:randomG blue:randomB alpha:1];
//
// self.view.backgroundColor = randomColor;
單擊隨機顏色.gif
//獲取手勢監控的視圖對象
UIImageView* imageView = (UIImageView*) tap.view;
//開始動畫過程
[UIView beginAnimations:nil context:nil];
//設置動畫過渡時間
[UIView setAnimationDuration:2];
//縮放布滿整個屏幕。 iPhone6 inch-4.7
imageView.frame = CGRectMake(0, 0, 375, 667);
//結束動畫過程
[UIView commitAnimations];
}
單擊放大.gif
#pragma mark - 雙擊縮小
UITapGestureRecognizer *tapTwoGes = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapTwoAct:)];
tapTwoGes.numberOfTapsRequired = 2;
tapTwoGes.numberOfTouchesRequired = 1;
[_imageView addGestureRecognizer:tapTwoGes];
#pragma bug 在原圖情況下，會先放大，在縮小。從打印方式可以看出，雙擊會先出現放大，后出現縮小。
# 解決方案 ↓
//當單擊操作遇到雙擊操作時，單擊操作失效
[tapOneGes requireGestureRecognizerToFail:tapTwoGes];
//雙擊縮小事件
- (void)tapTwoAct:(UITapGestureRecognizer *)tap
{
NSLog(@"縮小");
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2];
_imageView.frame = CGRectMake(34, 164, 306, 217);
[UIView commitAnimations];
}
（先單擊放大）雙擊縮小.gif
#pragma mark - 捏合 放大縮小
_pinchGes = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAct:)];
//將捏合手勢添加到視圖上去
[_imageView addGestureRecognizer:_pinchGes];
//捏合-放大縮小事件 按住alt鍵
- (void)pinchAct:(UIPinchGestureRecognizer *)pinch
{
NSLog(@"如果我有仙女棒，變大變小變漂亮");
//對圖像視圖進行矩陣變換計算并賦值
/*
transform 圖形學中的變換矩陣
CGAffineTransformScale 通過縮放的方式產生一個新的矩陣
參數1 : 原來的矩陣
參數2 : x方向的縮放比例
參數3 : y方向的縮放比例
返回值是新的縮放后的矩陣變換
*/
pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);
//將縮放值歸為單位值，否則會出現累加
/*
scale = 1 原來的大小
scale > 1 放大效果
scale < 1 縮小效果
*/
pinch.scale = 1;
}
捏合事件.gif
#pragma mark - 旋轉
_rotGes = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotAct:)];
[_imageView addGestureRecognizer:_rotGes];
//旋轉事件
- (void)rotAct:(UIRotationGestureRecognizer *)rot
{
NSLog(@"看我歪頭");
rot.view.transform = CGAffineTransformRotate(rot.view.transform, rot.rotation);
//選擇角度清零
rot.rotation = 0;
}
旋轉.gif
# 協議 - 同時識別手勢
_rotGes.delegate = self;
_pinchGes.delegate = self;
//Simultaneously 同時識別手勢 YES: 可以同時相應，NO: 不可以
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
同時識別旋轉放大縮小.gif
#pragma mark - 移動
_pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAct:)];
[_imageView addGestureRecognizer:_pan];
#這里，為了避免和平掃沖突，所以取消掉移動的事件。
//將移動事件從圖像視圖中取消
//[_imageView removeGestureRecognizer:_pan];
//平移 事件 只要手指發生變化，函數就被調用
- (void)panAct:(UIPanGestureRecognizer *)pan
{
// NSLog(@"111111111111");
// //獲取移動的坐標，相對于視圖的坐標而言
// CGPoint pt = [pan translationInView:self.view];
// NSLog(@"pt.x = %.2f , pt.y = %.2f",pt.x,pt.y);
//
// //獲取移動時的 相對速度 每秒在屏幕移動像素的值
// CGPoint pv = [pan velocityInView:self.view];
// NSLog(@"pv.x = %.2f , pv.y = %.2f",pv.x,pv.y);
//在pan.view上移動的距離
CGPoint translation = [pan translationInView:pan.view];
//view的中心
CGPoint center = pan.view.center;
//中心點.x + 移動距離.x
center.x = center.x + translation.x;
center.y = center.y + translation.y;
pan.view.center = center;
//清空移動距離
[pan setTranslation:CGPointZero inView:pan.view];
}
移動.gif
#pragma mark - 滑動（平掃）
_swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAct:)];
/*
UISwipeGestureRecognizerDirection
Right 向右
Left 向左
Up 向上
Down 向下
*/
// | 位或
_swipe.direction = UISwipeGestureRecognizerDirectionLeft|UISwipeGestureRecognizerDirectionRight;
[_imageView addGestureRecognizer:_swipe];
//滑動 事件
- (void)swipeAct:(UISwipeGestureRecognizer *)swipe
{
// NSLog(@"向左滑動");
#pragma mark - 有問題 ，不能分別打印
if (_swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"向左滑動");
}else{
NSLog(@"向右滑動");
}
}
打印出向右滑動
#pragma mark - 長按
UILongPressGestureRecognizer *press = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pressLong:)];
//設置長按手勢的時間，默認是0.5
press.minimumPressDuration = 3;
[_imageView addGestureRecognizer:press];
//長按事件
- (void)pressLong:(UILongPressGestureRecognizer *)press
{
//手勢的狀態對象，到達規定時間（3s），觸發函數
if (press.state == UIGestureRecognizerStateBegan) {
NSLog(@"開始！");
}
//當手指離開時，結束
else if (press.state == UIGestureRecognizerStateEnded)
{
NSLog(@"結束！");
}
NSLog(@"長按");
}
長按事件
