iOS 手勢的使用 六個手勢 輕拍 長按 拖拽 捏合 輕掃 旋轉
上面的手勢對應的操作是：
Tap（點一下） Pinch（二指往內或往外撥動，平時經常用到的縮放） Rotation（旋轉） Swipe（滑動，快速移動） Pan （拖移，慢速移動） LongPress（長按）
2、使用手勢的步驟
使用手勢很簡單，分為兩步：
建立手勢例項。當建立手勢時，指定一個回撥方法，當手勢開始，改變、或結束時，回撥方法被呼叫。 新增到需要識別的View中。每個手勢只對應一個View，當螢幕觸控在View的邊界內時，如果手勢和預定的一樣，那就會回撥方法。
ps：一個手勢只能對應一個View，但是一個View可以有多個手勢。
手勢具體操作 如下:
新建一個mainViewController 繼承於 UIViewcontroller ,
mainViewController.m
#import "mainViewController.h"
@interface mainViewController ()
@property (retain, nonatomic)UIImageView *imageView;
@end
@implementation mainViewController
- (void)dealloc{
[self.imageView release];
[super dealloc];
}
- (instancetype)initWithNibName:(NSString
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
}
return self;
}
- (void)viewDidLoad {
[superviewDidLoad];
// Do any additional setup after loading the view.
[selfcreateSubViews];
}
- (void
self.imageView = [[UIImageViewalloc] initWithFrame:CGRectMake(70, 130, 220, 350)];
[_imageViewsetImage:[UIImageimageNamed:@"1.jpg"]];
_imageView.userInteractionEnabled = YES;
[self.view addSubview:_imageView];
[_imageView release];
UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"點選", @"長按", @"輕掃", @"捏合", @"旋轉", @"拖拽", nil]];
segmentedControl.frame = CGRectMake(30, 600, 315, 50);
segmentedControl.momentary = YES;
segmentedControl.tintColor = [UIColor blackColor];
[segmentedControl addTarget:selfaction:@selector(action:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:segmentedControl];
[segmentedControl release];
}
#pragma mari - UISegmentedControl的點選事件
- (void)action:(id)sender{
// 分段點選按鈕
UISegmentedControl *seg = (UISegmentedControl *)sender;
// 移除imageView的所有手勢,重新新增新的手勢
// 第一步:獲得一個檢視的所有手勢
NSArray *gestures = self.imageView.gestureRecognizers;
// 第二步:移除
for (UIGestureRecognizer *ges in gestures) {
[self.imageViewremoveGestureRecognizer:ges];
}
switch (seg.selectedSegmentIndex) {
case 0:
{
// 建立一個點選手勢
UITapGestureRecognizer *tap = [[UITapGestureRecognizeralloc] initWithTarget:selfaction:@selector(tapAction:)];
[self.imageView addGestureRecognizer:tap];
[tap release];
}
break;
case 1:
{
// 長按手勢
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizeralloc] initWithTarget:selfaction:@selector(longPressAction:)];
[self.imageView addGestureRecognizer:longPress];
[longPress release];
}
break;
case 2:
{
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizeralloc] initWithTarget:selfaction:@selector(swipeAction:)];
// 一個輕掃手勢只能有一個輕掃方向
// 設定輕掃的方向
swipe.direction = UISwipeGestureRecognizerDirectionDown;
[self.imageView addGestureRecognizer:swipe];
[swipe release];
}
break;
case 3:
{
// 捏合手勢
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizeralloc] initWithTarget:selfaction:@selector(pinchAciton:)];
[self.imageView addGestureRecognizer:pinch];
[pinch release];
}
break;
case 4:
{
// 旋轉手勢
UIRotationGestureRecognizer *rotate = [[UIRotationGestureRecognizeralloc] initWithTarget:selfaction:@selector(rotateAction:)];
[self.imageView addGestureRecognizer:rotate];
[rotate release];
}
break;
case 5:
{
// 拖拽手勢
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizeralloc] initWithTarget:selfaction:@selector(panAction:)];
[self.imageView addGestureRecognizer:pan];
[pan release];
}
break;
default:
break;
}
}
#pragma mark - 內部的點選手勢事件
#pragma mark 點選
- (void)tapAction:(UITapGestureRecognizer *)tap{
// 通過手勢獲得手勢所在的檢視
// UIImageView *aImage = (UIImageView *)tap.view;
// 通過不同的狀態做不同的事
if (tap.state == UIGestureRecognizerStateBegan) {
NSLog(@"開始點選");
}
NSLog(@"%s", __func__);
}
#pragma mark 長按
- (void)longPressAction:(UILongPressGestureRecognizer *)press{
if (press.state == UIGestureRecognizerStateBegan) {
NSLog(@"begin");
}
}
#pragma mark 輕掃
- (void)swipeAction:(UISwipeGestureRecognizer *)swipe{
NSLog(@"橫掃千軍");
}
#pragma mark 捏合
- (void)pinchAciton:(UIPinchGestureRecognizer *)pinch{
NSLog(@"捏合");
self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale);
pinch.scale = 1.0f;
}
#pragma mark 旋轉
- (void)rotateAction:(UIRotationGestureRecognizer *)ges{
// 旋轉的基礎角度為0, 每次旋轉的角度都是以當前中軸線為軸來判定的
self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, ges.rotation);
ges.rotation = 0;
NSLog(@"Rotation = %f", ges.rotation);
}
#pragma mark 拖拽
- (void)panAction:(UIPanGestureRecognizer *)pan{
CGPoint point = [pan translationInView:self.imageView];
// 偏移量會在每次偏移之後,在偏移後的基礎上增加
self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, point.x, point.y);
// 重新把偏移量歸零
[pan setTranslation:CGPointZeroinView:self.imageView];
}
AppDelegate.m
#import "AppDelegate.h"
#import "mainViewController.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (void)dealloc{
[super dealloc];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window = [[UIWindowalloc] initWithFrame:[[UIScreenmainScreen] bounds]];
_window.backgroundColor = [UIColorwhiteColor];
[_windowmakeKeyAndVisible];
[_window release];
mainViewController *myView = [[mainViewControlleralloc] init];
[self.windowsetRootViewController:myView];
[myView release];
return YES;
}