1攒霹、手勢識別器——UIGestureRecognizer 介紹
在ios開發(fā)中怯疤，除了有關(guān)觸摸的這組方法來控制使用用者的手指觸控外，還可以用UIGestureRecognizer的衍生類來進(jìn)行判斷催束。
用UIGestureRecognizer的好處在于有現(xiàn)成的手勢集峦，開發(fā)者不用自己計算手指移動軌跡，創(chuàng)建了這些手勢識別器之后可以調(diào)用視圖的addGestureRecognizer:方法，將手勢識別器注冊到某個視圖組件上塔淤。
UIGestureRecognizer是在Touch的基礎(chǔ)上封裝出來的摘昌。
UIGestureRecognizer的子類類別有以下幾種：
- UIPanGestureRecognizer（拖動識別器）
- UIPinchGestureRecognizer（捏合識別器）
- UIRotationGestureRecognizer（旋轉(zhuǎn)識別器）
- UITapGestureRecognizer（輕拍識別器）
- UILongPressGestureRecognizer（長按識別器）
- UISwipeGestureRecognizer（掃動識別器）
2、各個手勢的例子：
#import "ViewController.h"
@interface ViewController ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate>
@property (weak, nonatomic) IBOutlet UIView *targetView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//單擊
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapAction:)];
[self.view addGestureRecognizer:singleTap];
//雙擊
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapAction:)];
doubleTap.numberOfTapsRequired = 2;
[self.view addGestureRecognizer:doubleTap];
//單擊要想執(zhí)行必須雙擊失效（如果雙擊確定偵測失敗才會觸發(fā)單擊）
[singleTap requireGestureRecognizerToFail:doubleTap];
//長按手勢
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];
[self.targetView addGestureRecognizer:longPress];
//捏合手勢
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGestureAction:)];
[self.targetView addGestureRecognizer:pinchGesture];
//拖拽
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
[self.targetView addGestureRecognizer:panGesture];
//旋轉(zhuǎn)
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
[self.targetView addGestureRecognizer:rotation];
//縮放要想執(zhí)行 必須旋轉(zhuǎn)失效（如果旋轉(zhuǎn)確定偵測失敗才會觸發(fā)縮放）
[pinchGesture requireGestureRecognizerToFail:rotation];
//左橫掃
UISwipeGestureRecognizer *leftSwipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipAction:)];
[self.view addGestureRecognizer:leftSwipeGesture];
leftSwipeGesture.direction = UISwipeGestureRecognizerDirectionLeft;
//右橫掃
UISwipeGestureRecognizer *rightSwipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipAction:)];
[self.view addGestureRecognizer:rightSwipeGesture];
rightSwipeGesture.direction = UISwipeGestureRecognizerDirectionRight;
//下橫掃
UISwipeGestureRecognizer *downSwipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipAction:)];
[self.view addGestureRecognizer:downSwipeGesture];
downSwipeGesture.direction = UISwipeGestureRecognizerDirectionDown;
//上橫掃
UISwipeGestureRecognizer *upSwipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipAction:)];
[self.view addGestureRecognizer:upSwipeGesture];
upSwipeGesture.direction = UISwipeGestureRecognizerDirectionUp;
}
#pragma mark -----橫掃
-(void)swipAction:(UISwipeGestureRecognizer *)sender{
CATransition *animation = [CATransition animation];//創(chuàng)建CATransition對象
animation.delegate = self;
animation.duration = 1.0f;//動畫持續(xù)時間
animation.timingFunction = UIViewAnimationCurveEaseInOut;//速度控制函數(shù)高蜂，控制動畫運(yùn)行的節(jié)奏
animation.type = kCATransitionMoveIn; //設(shè)置運(yùn)動type
switch (sender.direction) {
case UISwipeGestureRecognizerDirectionRight: //向右滑
{
animation.subtype = kCATransitionFromLeft;//視圖從左開始
}
break;
case UISwipeGestureRecognizerDirectionLeft:
{
animation.subtype = kCATransitionFromRight;//視圖向左滑
}
break;
case UISwipeGestureRecognizerDirectionUp://向上滑
{
animation.subtype = kCATransitionFromTop;
}
break;
case UISwipeGestureRecognizerDirectionDown: //向下滑
{
animation.subtype = kCATransitionFromBottom;
}
break;
default:
break;
}
[sender.view.layer addAnimation:animation forKey:@"move in"];
}
#pragma mark ------ 拖拽
-(void)panAction:(UIPanGestureRecognizer *)sender{
//當(dāng)手勢按在視圖上面的點(diǎn)聪黎，轉(zhuǎn)為父系坐標(biāo) 拿到中心點(diǎn)
/*CGPoint translatedPoint=[sender translationInView:self.view];
CGFloat firstX;
CGFloat firstY;
if ([sender state]==UIGestureRecognizerStateBegan) {
firstX=[sender.view center].x;
firstY=[sender.view center].y;
}
translatedPoint=CGPointMake(firstX+translatedPoint.x, firstY+translatedPoint.y);
[sender.view setCenter:translatedPoint];*/
//中心拖拽
//當(dāng)你的狀態(tài)不等于結(jié)束狀態(tài)，不等于失敗狀態(tài)
/*if (sender.state != UIGestureRecognizerStateEnded && sender.state != UIGestureRecognizerStateFailed) {
CGPoint location = [sender locationInView:sender.view.superview];
sender.view.center = location;
}*/
//視圖前置操作
[sender.view.superview bringSubviewToFront:sender.view];
//拖拽
CGPoint center = sender.view.center;
CGFloat cornerRadius = sender.view.frame.size.width / 2;
CGPoint translation = [sender translationInView:self.view];
//NSLog(@"%@", NSStringFromCGPoint(translation));
sender.view.center = CGPointMake(center.x + translation.x,center.y +translation.y);
[sender setTranslation:CGPointZero inView:self.view];
//動畫效果
if (sender.state == UIGestureRecognizerStateEnded) {
//計算速度向量的長度备恤，當(dāng)他小于200時稿饰，滑行會很短
CGPoint velocity = [sender velocityInView:self.view];
CGFloat magnitude = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y));
CGFloat slideMult = magnitude / 200;
//基于速度和速度因素計算一個終點(diǎn)
float slideFactor = 0.1 * slideMult;
CGPoint finalPoint = CGPointMake(center.x + (velocity.x * slideFactor),center.y + (velocity.y * slideFactor));
//限制最小［cornerRadius］和最大邊界值［ self.view.bounds.size.width - cornerRadius］烘跺，以免拖動出屏幕界限
finalPoint.x = MIN(MAX(finalPoint.x, cornerRadius),self.view.bounds.size.width - cornerRadius);
finalPoint.y = MIN(MAX(finalPoint.y, cornerRadius),self.view.bounds.size.height - cornerRadius);
[UIView animateWithDuration:slideFactor*2 delay:0 options:UIViewAnimationOptionCurveEaseOut
animations:^{
sender.view.center = finalPoint;
}
completion:nil];
}
}
#pragma mark ----- 旋轉(zhuǎn)
-(void)rotationAction:(UIRotationGestureRecognizer *)sender{
sender.view.transform = CGAffineTransformRotate(sender.view.transform, sender.rotation);
sender.rotation=10.0;//旋轉(zhuǎn)速度
}
#pragma mark ----- 縮放
-(void)pinchGestureAction:(UIPinchGestureRecognizer *)sender{
NSLog(@"xxx");
sender.view.transform=CGAffineTransformMakeScale(sender.scale, sender.scale);
}
# pragma mark -----長按
-(void)longPressAction:(UILongPressGestureRecognizer *)sender{
if (sender.state == UIGestureRecognizerStateEnded) {
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"標(biāo)題" message:@"選擇照片" preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *photoAction = [UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"調(diào)用照相機(jī)");
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIImagePickerController *imagepicker = [[UIImagePickerController alloc] init];
imagepicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagepicker.delegate = self;
imagepicker.allowsEditing = YES;//允許圖片被編輯
imagepicker.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentViewController:imagepicker animated:NO completion:nil];
}
}];
[alertController addAction:photoAction];
UIAlertAction *libraryAction=[UIAlertAction actionWithTitle:@"相冊" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"調(diào)用本地相冊");
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
UIImagePickerController *picker =
[[UIImagePickerController alloc] init];
picker.delegate=self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:picker animated:NO completion:nil];
}
}];
[alertController addAction:libraryAction];
UIAlertAction *cancleAction=[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"取消");
}];
[alertController addAction:cancleAction];
[self presentViewController:alertController animated:YES completion:nil];
}
}
#pragma mark ---- 單擊
-(void)singleTapAction:(UITapGestureRecognizer *)sender{
NSLog(@"單擊");
//改變背景顏色
if (sender.view.backgroundColor==[UIColor whiteColor]) {
sender.view.backgroundColor=[UIColor cyanColor];
}else{
sender.view.backgroundColor=[UIColor whiteColor];
}
}
#pragma mark------- 雙擊
-(void)doubleTapAction:(UITapGestureRecognizer *)sender{
NSLog(@"雙擊");
}
@end