从今若许闲乘月，拄杖无时夜叩门！
在视图控制器中代码实现照片对手势的响应,进行一些平移,旋转,或者变色等一些操作的实现,一般不建议在视图控制里面进行布局,此处方便学习手势的控制,在ViewController进行了一个图片的布局,下面是详细的介绍
//要想实现手势首先必须满足手势协议
@interface rootViewController ()
//声明一个UIImageView属性用来放添加手势的照片
@property(nonatomic,strong)UIImageView *imageView;
实现部分：
//给UIImageView布局加照片 不过好像很少有人在这个方法里面弄可以去ViewDidLoad方法里面弄
-(instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])
{
//self.imageView = [[MyImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];
self.imageView = [[UIImageView alloc ] initWithFrame:CGRectMake(100, 200, 300, 400)];
self.imageView.image = [UIImage imageNamed:@"照片名.格式"];
self.imageView.userInteractionEnabled=YES;
}
[self.view addSubview:self.imageView];
return self;
}
方法实现
//实现协议内部的方法,Simultaneously: 同时识别手势
//如果想要同时触发手势的作用,需要实现此方法
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(nonnull UIGestureRecognizer *)otherGestureRecognizer
{
NSLog(@"可以手势!");
return YES;
}
//自定义旋转图片方法的手势
-(void)rotationGesture
{
UIRotationGestureRecognizer*rotationXuanZhuan = [UIRotationGestureRecognizer new];
//手势添加响应事件
[rotationXuanZhuan addTarget:selfaction:@selector(XuanZhuan:)];
//图片上添加手势
// [self.imageView.picture addGestureRecognizer:rotationXuanZhuan];
[self.imageView addGestureRecognizer:rotationXuanZhuan];
}
//定义旋转方法事件
-(void)XuanZhuan:(UIRotationGestureRecognizer * )rorationXZ
{
/*
struct
CGAffineTransform {
CGFloat a, b,
c, d;
CGFloat tx,
ty;
};
其中a,d表示放大缩小有关
b,c表示的是选择角度有关
tx,ty是和平移有关*/
rorationXZ.view.transform = CGAffineTransformRotate(rorationXZ.view.transform, rorationXZ.rotation);
rorationXZ.rotation=0;//rotation代表旋转弧度
NSLog(@"转转转转!!");
}
//封装一个长按手势
-(void)longPressGesture
{
UILongPressGestureRecognizer *longPress =[UILongPressGestureRecognizer new];
[longPress addTarget:self action:@selector(longPress)];
//至少按0.5秒才会有反应 一个属性
longPress.minimumPressDuration = 0.5;
[self.imageView addGestureRecognizer:longPress];
}
定义长按手势的事件
-(void)longPress
{
NSLog(@"你在长按着我~~");
// self.imageView.backgroundColor = [UIColor redColor];// 图片背景变成红色
self.view.backgroundColor=[UIColor yellowColor];//背景变成黄色
}
//封装平移手势
-(void)panGusture
{
UIPanGestureRecognizer *pan = [UIPanGestureRecognizer new];
[pan addTarget:self action:@selector(panView:)];
//将手势添加到图片上
[self.imageView addGestureRecognizer:pan];
}
//实现平移方法事件
-(void)panView:(UIPanGestureRecognizer *)pan
{
NSLog(@"~~~~~我要平移~~~~~~~~~~~~%@",pan);
//在pan.view上移动的距离
CGPoint translation = [pan translationInView:pan.view];
//获取View的中心点
CGPoint center = pan.view.center;
//中心点的x值+挪动距离的x值
center.x = center.x + translation.x;
//中心点的y值+挪动距离的y值
center.y = center.y+translation.y;
pan.view.center = center;
//清空移动距离
[pan setTranslation:CGPointZero inView:pan.view];
}
//封装缩放手势
-(void)pinchgesture
{
UIPinchGestureRecognizer *pinch = [UIPinchGestureRecognizer new];
[pinch addTarget:self action:@selector(pinchView:)];
//将手势添加到图片之上
[self.imageView addGestureRecognizer:pinch];
}
//实现缩放的手势事件
-(void)pinchView:(UIPinchGestureRecognizer *)pinch
{
NSLog(@"捏合,捏一捏~~~~~~");
pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);
//scale 相对于屏幕来说的坐标点
pinch.scale = 1;
}
//添加相应的方法
- (void)viewDidLoad {
[super viewDidLoad];
//[self rotationGesture];
// [self longPressGesture];
// [self panGusture];
[self pinchgesture];
}