UI - Target-Action设计模式

target -action设计模式分5个步骤来完成
warning部分即为步骤顺序

#TouchView.h#import <UIKit/UIKit.h>@interface TouchView : UIView#warning 1.给外界提供目标和动作属性,让外界可以设置@property(nonatomic,retain)id target; // 目标@property(nonatomic,assign)SEL action; // 动作@end#TouchView.m#import "TouchView.h"@implementation TouchView#warning 2.重写dealloc方法释放对应的实例变量- (void)dealloc{    [_target release];    [super dealloc];}-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    // 1.我们现在面临了什么问题    // 2.通过到目前为止学过的知识点 怎样可以实现题目的需求//    [self ChangeColor];    // 更改为目标去执行[目标 方法];#warning 4.在某个时间点让目标取执行对应的方法    [_target performSelector:_action withObject:self];    // 让target去执行action这个方法并且把self参数传出去 (self:当前点击的touchView)}#RootViewController.m#import "RootViewController.h"#import "TouchView.h"@interface RootViewController ()@end@implementation RootViewController- (void)viewDidLoad {    [super viewDidLoad];    // target - action设计模式    /**     target - action 是模仿系统的Button 即将事件的处理交给外界 不在自己的内部写死     target-action设计模式主要涉及到两方面的内容     target:目标     action:动作     target-action可以让不同的实例对象在相同的时间点执行不用的方法 从而达到不同的效果     target-action设计模式存在的意义即将时间分离 View只负责显示 具体的事情处理交给Controller 是MVC中View层和Controller层通信的一种方式     */    // 创建三个实例对象    TouchView *changeColorView = [[TouchView alloc]initWithFrame:CGRectMake(50, 50, 100, 100)];    changeColorView.backgroundColor = [UIColor yellowColor];#warning 3.在外界设置target action    changeColorView.target = self;    changeColorView.action = @selector(ChangeColor:);    [self.view addSubview:changeColorView];    TouchView *changePostionView = [[TouchView alloc]initWithFrame:CGRectMake(50, 200, 100, 100)];    changePostionView.backgroundColor = [UIColor redColor];    changePostionView.target = self;    changePostionView.action = @selector(ChangePostion:);    [self.view addSubview:changePostionView];    TouchView *changeSizeView = [[TouchView alloc]initWithFrame:CGRectMake(50, 350, 100, 100)];    changeSizeView.backgroundColor = [UIColor purpleColor];    changeSizeView.target = self;    changeSizeView.action = @selector(ChangeBounds:);    [self.view addSubview:changeSizeView];    [changeColorView release];    [changePostionView release];    [changeSizeView release];}#warning 5.实现action方法//- (void)ChangeColor:(TouchView *)view//{//    // 1.修改self.view的颜色为红色////    self.view.backgroundColor = [UIColor redColor];//    // 2.修改当前点击视图的颜色为随机色//    view.backgroundColor = [UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1.0];//}#pragma mark - 改变背景颜色- (void)ChangeColor:(TouchView *)view{    view.backgroundColor = [UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1.0];}#pragma mark - 改变视图位置- (void)ChangePostion:(TouchView *)view{    CGFloat minX = 0;    CGFloat maxX = [[UIScreen mainScreen]bounds].size.width;    CGFloat x = arc4random()%(int)(maxX - minX + 1) + minX;    CGFloat minY = 0;    CGFloat maxY = [[UIScreen mainScreen]bounds].size.height;    CGFloat y = arc4random()%(int)(maxY - minY + 1) + minY;    view.center = CGPointMake(x, y);}#pragma mark - 改变视图大小- (void)ChangeBounds:(TouchView *)view{    CGFloat minWidth = 38;    CGFloat maxWidth = [[UIScreen mainScreen]bounds].size.width;    CGFloat width = arc4random()%(int)(maxWidth - minWidth + 1) + minWidth;    CGFloat minHeight = 38;    CGFloat maxHeight = [[UIScreen mainScreen]bounds].size.height;    CGFloat height = arc4random()%(int)(maxHeight - minHeight + 1) + minHeight;    view.bounds = CGRectMake(0, 0, width, height);}