GestureRecginzer：手势识别
(void)viewDidLoad {
[super
viewDidLoad];
//改变自身颜色
ActionView
*redView =
[[ActionView alloc]initWithFrame:CGRectMake(20, 20, 280, 100)];
redView.tag = 101;
[ redView addTarget:self action:@selector(changeselfBackground :)];
redView.backgroundColor = [UIColor randomClolor];
[self.view addSubview:redView];
[redView release];}
mark --Target....action 设计模式的方法实现
//改变自身颜色
(void)changeselfBackground
: (ActionView *)view{
view.backgroundColor = [UIColor randomClolor];
//给外界提供一个接口(方法)，用来给ActionView
制定事件的响应对象（目标 target），以及target目标响应的方法
- (void)addTarget : (id)target action:(SEL)action;
{
id _target;//存储传入的响应对象
SEL _action;//存储响应对象执行的方法
}
@end
是自定义的视图，我们想把它封装成完成的类，一个完整的类，就是无论你再有什么样的需求，都无需去修改它的源文件
以前的处理方式不够灵活，因为ActionView创建的对象没接到触摸消息，都要自己去处理事件，所以每创建一个对象，提出一个新的需求都要区修改它的源文件，此时ActionView对象和事件就捆绑到一起了，此时耦合性太强
...action设计模式，将事件交由其他对象处理，让我们的ActionView像UIButton一样灵活，此时它只需负责通过目标干活就可以了，此时的ActionView对象和事件就不再捆绑到一起了，耦合性降低了，内聚就升高了
(void)addTarget : (id)target action:(SEL)action{
//此时在这个方法中要把外界传进来的目标对象，和目标对象要执行的方法存储起来
_target
= target;
_action
= action;
}
- (void)touchesBegan:(NSSet *)touches
withEvent:(UIEvent *)event{
对象接受到触摸事件的时候，自己不处理事件，需要由_target
来处理
...action 方法的调用
[_target
performSelector:_action withObject:self];
事件和touchView的耦合
1.制订协议(代理要完成的任务)
2.定义代理属性(存储代理对象)
3.在其他文件中指定touchView的代理对象 (帮touchView干活)
4.让代理对象服从协议(代理对象答应帮touchView)干活
5.让代理对象实现协议中的方法(代理对象知道怎么去干活)
@class
TouchView;
@protocol TouchViewDelegate
<</span>NSObject>
@optional
//刚开始触摸的时候让代理对象完成这个方法
(void)touchBeganWithTouchView
: (TouchView *)touchView;
: UIView
//第二步：第一代理属性
- (void)touchesBegan:(NSSet *)touches
withEvent:(UIEvent *)event{
//第六步：让代理对象干活
if ([_delegate respondsToSelector:@selector(touchBeganWithTouchView:)])
{
[_delegate
touchBeganWithTouchView:self];}}
()<</span>TouchViewDelegate>
@end
@implementation DelegateViewController
- (void)viewDidLoad {
[super
viewDidLoad];
self.view.backgroundColor = [UIColor yellowColor];
TouchView
*redView =
[[TouchView alloc]initWithFrame:CGRectMake(20, 30, 280, 100)];
redView.backgroundColor = [UIColor redColor];
//第三步：指定代理对象
redView.delegate = self;
[self.view addSubview:redView];
[redView release];
}
//第五步：实现协议中的方法
(void)touchBeganWithTouchView:(TouchView
*)touchView{
touchView.backgroundColor = [UIColor randomClolor];//随机颜色自己做一下封装
*gesture = [[GestureViewControlleralloc]init];
self.window.rootViewController
=
gesture;
[gesture release];
"GestureViewController.h"
{
[super
viewDidLoad];
self.view.backgroundColor
= [UIColor
colorWithPatternImage:[UIImage
imageNamed:@"444.jpg"]];
// UIGestureRecognizer 手势识别器的基类
，拓为我们提供了手势识别器的一些基本的功能，我们在屏幕上的手势全部由手势识别器来完成识别，此时我们只需要关心手势识别之后应该做出什么处理
，它由6大子类，还有一个孙子类(屏幕边缘手势，是平移手势的子类)
UIView
*redView = [[UIView
alloc]initWithFrame:CGRectMake(0,
20,
320,
500)];
redView.backgroundColor
= [UIColor
redColor];
[self.view
addSubview:redView];
[redView release];
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer
alloc]initWithTarget:self action:@selector(handleTap :)];
//配置属性
//设置轻拍手势触发时间所需的轻拍次数
tapGesture.numberOfTapsRequired = 1;//默认为1下
//设置轻拍需要的手指对象个数
tapGesture.numberOfTouchesRequired = 2;
//给redView添加轻拍的手势对象
[redView
addGestureRecognizer:tapGesture];
[tapGesture release];
(void)handleTap
: (UITapGestureRecognizer *)tapGesture{
tapGesture.view.backgroundColor = [UIColor
randomClolor];}
*longGesture = [[UILongPressGestureRecognizer
alloc]initWithTarget:self action:@selector(handleLongPress
:)];
//设置长按手势最小多长时间触发方法
longGesture.minimumPressDuration = 1;//默认为.05秒
//在视图上添加手势对象
[redView
addGestureRecognizer:longGesture];
//释放
[longGesture release];
长按手势方法实现
-
(void)
handleLongPress : (UILongPressGestureRecognizer
*)longPress{
//改变手势所在视图的父视图的颜色
//根据手势状态，选择执行相应操作
if
(longPress.state
==
UIGestureRecognizerStateBegan)
{
longPress.view.superview.backgroundColor
=
[UIColor
randomClolor];
}
*swipeGesture
= [[UISwipeGestureRecognizer
alloc]initWithTarget:self
action:@selector(handleSwipe:)];
//设置轻扫的方向
swipeGesture.direction
=
UISwipeGestureRecognizerDirectionRight;
[redView addGestureRecognizer:swipeGesture];
[swipeGesture release];
mark 轻扫手势方法的实现
-
(void)handleSwipe:
(UISwipeGestureRecognizer
*)swipeGesture{
swipeGesture.view.backgroundColor
=
[UIColor
randomClolor];
UIPanGestureRecognizer
*panGesture =
[[UIPanGestureRecognizer
alloc]initWithTarget:self
action:@selector(handlePan
: )];
[redView addGestureRecognizer:panGesture];
[panGesture release];
mark 平移手势方法的实现
-
(void)handlePan
: (UIPanGestureRecognizer
*)panGesture{
//1.获取平移增量
CGPoint
point =
[panGesture translationInView:panGesture.view];
//2.仿射变换(变形)
//第一个参数：变形之前的视图位置和大小
//第二个参数：x轴上的形变量（x轴上的增量）
//第三个参数：y轴上的形变量（y轴上的增量）
panGesture.view.transform
=
CGAffineTransformTranslate(panGesture.view.transform,point.x,
point.y);
//3.将之前的增量清0；
//CGPointZero
代表{0,0}点
CGPointMake(0,0);
[panGesture setTranslation:CGPointZero
inView:panGesture.view];
UIPinchGestureRecognizer
UIPinchGestureRecognizer
*pinchGesture
= [[UIPinchGestureRecognizer
alloc]initWithTarget:self
action:@selector(handlePinch
:)];
[redView addGestureRecognizer:pinchGesture];
[pinchGesture release];
捏合手势方法的实现
-
(void)handlePinch
: (UIPinchGestureRecognizer
*)pinchGesture{
pinchGesture.view.transform
=
CGAffineTransformScale(pinchGesture.view.transform,
pinchGesture.scale,
pinchGesture.scale);
//scale
缩放比例
//将之前的形变量置为1；
pinchGesture.scale
=
1;
UIRotationGestureRecognizer
*rotationGesture
= [[UIRotationGestureRecognizer
alloc]initWithTarget:self
action:@selector(handleRotationGesture
: )];
[redView addGestureRecognizer:rotationGesture];
[rotationGesture release];
旋转手势方法的实现
-
(void)handleRotationGesture
: (UIRotationGestureRecognizer
*)RotationResture{
RotationResture.view.transform
=
CGAffineTransformRotate(RotationResture.view.transform,
RotationResture.rotation);
//将之前的角度增量置为0
RotationResture.rotation
=
0;
//屏幕边缘的手势必须和硬件设备的边缘重合，此时这个手势才有作用
UIScreenEdgePanGestureRecognizer
*screenGesture
= [[UIScreenEdgePanGestureRecognizer
alloc]initWithTarget:self
action:@selector(handleScreenGesture:
)];
//设置屏幕的边缘
screenGesture.edges
=
UIRectEdgeLeft;
[redView addGestureRecognizer:screenGesture];
[screenGesture release];
mark 屏幕边缘手势方法的实现
-
(void)
handleScreenGesture : (UIScreenEdgePanGestureRecognizer
*)screen{
NSLog(@"小样你能行吗？");
}