标签：
?、target/action设计模式
耦合
耦合是衡量?个程序写的好坏的标准之?， 是衡量模块与模块之间关联程度的指标。 “?内聚，低耦合”是?向对象编程的核?思想。
使?target…action实现解耦
touchView.h:
@interface TouchView : UIView
@property (nonatomic, retain) id target;
@property (nonatomic, assign) SEL action;
- (instancetype)initWithTarget:(id)target action:(SEL)action;
touchView.m
- (instancetype)initWithTarget:(id)target action:(SEL)action
{
self = [super init];
if (self) {
self.target = target;
self.action = action;
}
return self;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"clicked");
[self.target performSelector:self.action withObject:self];
}
RootViewController.h
#import "RootViewController.h"
#import "TouchView.h"
#import "UIColor+RandomColor.h"
@interface RootViewController ()
@property (nonatomic, retain) TouchView *aTouchView;
@end
@implementation RootViewController
- (void)dealloc
{
[_aTouchView release];
[super dealloc];
}
- (void)viewDidLoad {
[super viewDidLoad];
self.aTouchView = [[TouchView alloc] initWithTarget:self action:@selector(changeColor:)];
//changeColor:方法的参数为TouchView.m中performSelector: withObject:方法的obj
//[_target performSelector:sel withObject:obj];
//一个Target-Action在一个时间只能做一个事件
self.aTouchView.frame = CGRectMake(100, 100, 200, 200);
self.aTouchView.backgroundColor = [UIColor redColor];
[self.view addSubview:_aTouchView];
[self.aTouchView release];
self.view.backgroundColor = [UIColor blueColor];
}
- (void)changeColor:(TouchView *)view
{
view.backgroundColor = [UIColor randomColor];
}
@end
?、代理设计模式
delegate也是?来解耦的，它不再简简单单让?标去执??个动 作了，?是delegate去处理?些列事件、就像UITextFieldDelegate? 样，能监测将要开始编辑，已经开始编辑、return按钮点击等等。
通过使用代理设计模式，实现开始点击自定义视图touchView时变换颜色，结束点击时变换位置
TouchViewDelegate.h
#import <Foundation/Foundation.h>
@class TouchView;
//#import "TouchView.h"
@protocol TouchViewDelegate <NSObject>
@optional
- (void)touchViewTouchBegan:(TouchView *)touchView; //做饭
- (void)touchViewTouchMoved:(TouchView *)touchView;
- (void)touchViewTouchEnd:(TouchView *)touchView;
- (void)touchViewTouchCancel:(TouchView *)touchView;
@end
touchView.h
@interface TouchView : UIView
@property (nonatomic, assign) id<TouchViewDelegate> delegate; //保姆
@end
toucheView.m
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event // 饿了
{
#pragma mark -- Delegate --
if ([self.delegate respondsToSelector:@selector(touchViewTouchBegan:)]) {
[self.delegate touchViewTouchBegan:self];
}
if ([self.delegate respondsToSelector:@selector(touchViewTouchEnd:)]) {
[self.delegate touchViewTouchEnd:self];
}
}
RootViewController.m
#import "RootViewController.h"
#import "TouchView.h"
@interface RootViewController ()
{
TouchView *_touchView1;
TouchView *_touchView2;
}
@end
@implementation RootViewController
- (void)viewDidLoad {
[super viewDidLoad];
_touchView1 = [[TouchView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
_touchView1.backgroundColor = [UIColor blueColor];
#pragma mark -- Delegate --
//设置代理
_touchView1.delegate = self;
[self.view addSubview:_touchView1];
[_touchView1 release];
}
#pragma mark -- Delegate --
- (void)touchViewTouchBegan:(TouchView *)touchView //做饭
{
touchView.backgroundColor = [UIColor colorWithRed:arc4random() %256 / 255.0 green:arc4random() %256 / 255.0 blue:arc4random() %256 / 255.0 alpha:arc4random() %100 / 100.0];;
}
- (void)touchViewTouchEnd:(TouchView *)touchView
{
touchView.center = CGPointMake(50, 50);
}
@end
利用家庭－保姆来理解：
TouchView: 家庭类
ContainerViewController:保姆类
TouchViewDelegate: 协议
三、UIImageView
UIImageView是iOS中?于显?图?的类，iOS中?乎所有看到的 图?，都是由这个类来显?的。
下面用UIImageView分别演示如何添加静态和动态图片
注：以下代码写在RootViewController.m中
#import "RootViewController.h"
#import "UIColor+RandomColor.h"
@interface RootViewController ()
@property (nonatomic,retain) UIImageView *imgView;
@end
@implementation RootViewController
- (void)dealloc
{
[_imgView release];
[super dealloc];
}
- (void)viewDidLoad {
[super viewDidLoad];
#pragma mark -- UImageView --
self.imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.png"]];
// 如果设置_imgView.frame,则图片大小为frame大小，发生形变。若不设置，则frame的大小为图片的大小
// _imgView.frame = CGRectMake(0, 0, 371, 600);
NSLog(@"%.f %.f", _imgView.frame.size.width, _imgView.frame.size.height);
[self.view addSubview:_imgView];
[_imgView release];
#pragma mark -- 使用UIImageView播放动画图片gif --
UIImageView * animationImage = [[UIImageView alloc] init];
animationImage.frame = CGRectMake(100, 350, 150, 150);
NSMutableArray * imagesArr = [NSMutableArray array];
for (int i = 1; i<4; i++) {
UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"tu%d.tiff", i]];
[imagesArr addObject:image];
}
animationImage.animationImages = imagesArr;
animationImage.animationDuration = 0.1;
[animationImage startAnimating];
// [animationImage stopAnimating];
[self.view addSubview:animationImage];
[animationImage release];
}
...
@end
四、?势识别器
?势识别器是对触摸事件做了封装，我们?需??去判断某个?势 是否触发，?势识别器本?起到了识别作?，我们把重?放在识别之 后要做什么操作上?。
?势识别器有7个?类,?旦指定的?势被识别，我们可以执?我们??定义好的操作。
轻拍?势:UITapGestureRecognizer
平移?势:UIPanGestureRecognizer
轻扫?势: UISwipeGestureRecognizer
捏合?势:UIPinchGestureRecognizer
旋转?势:UIRotationGestureRecognizer
?按?势:UILongPressGestureRecognizer
屏幕边界平移?势: UIScreenEdgePanGestureRecognizer(iOS7+)
RootViewController.m
@interface RootViewController ()
@property (nonatomic,retain) UIImageView *imgView;
@property (nonatomic, retain) UIView *tapView;
@end
@implementation RootViewController
- (void)dealloc
{
[_imgView release];
[_tapView release];
[super dealloc];
}
- (void)viewDidLoad {
[super viewDidLoad];
#pragma mark -- UIGestureRecognizer --
UIView * tapView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
tapView.backgroundColor = [UIColor grayColor];
self.tapView = tapView;
[self.view addSubview:tapView];
[tapView release];
//轻拍手势
UITapGestureRecognizer * tapGR = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapOnce:)];
//添加手势
[self.tapView addGestureRecognizer:tapGR];
[tapGR release];
//长按手势
UILongPressGestureRecognizer * longGR = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
[self.tapView addGestureRecognizer:longGR];
[longGR release];
//平移手势
UIPanGestureRecognizer * panGR = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
[self.tapView addGestureRecognizer:panGR];
// [animationImage addGestureRecognizer:panGR];
[panGR release];
//捏合手势
UIPinchGestureRecognizer * pinchGR = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
[self.tapView addGestureRecognizer:pinchGR];
[pinchGR release];
//旋转
UIView * aView = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 100, 100)];
aView.backgroundColor = [UIColor brownColor];
[self.view addSubview:aView];
[aView release];
UIRotationGestureRecognizer * rotationGR = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
[aView addGestureRecognizer:rotationGR];
[rotationGR release];
//轻扫
// UISwipeGestureRecognizer
//屏幕边界平移手势
// UIScreenEdgePanGestureRecognizer
}
- (void)tapOnce:(UITapGestureRecognizer *)GR
{
// self.tapView.hidden = YES;
// self.tapView.backgroundColor = [UIColor randomColor];
NSLog(@"");
}
- (void)longPress:(UILongPressGestureRecognizer *)GR
{
GR.view.backgroundColor = [UIColor randomColor];
}
- (void)pan:(UIPanGestureRecognizer *)GR
{
CGPoint translation = [GR translationInView:GR.view];
NSLog(@"%@", NSStringFromCGPoint(translation));
CGPoint center = GR.view.center;
center.x += translation.x;
center.y += translation.y;
GR.view.center = center;
[GR setTranslation:CGPointMake(0, 0) inView:GR.view];
}
- (void)pinch:(UIPinchGestureRecognizer *)GR
{
GR.view.transform = CGAffineTransformScale(GR.view.transform, GR.scale, GR.scale);
GR.scale = 1;
}
- (void)rotation:(UIRotationGestureRecognizer *)GR
{
//第二个参数是弧度
//180度 3.1415926 M_PI
GR.view.transform = CGAffineTransformRotate(GR.view.transform, GR.rotation);
GR.rotation = 0;
}
...
@end
transform是view的?个重要属性，它在矩阵层?上改变view的显? 状态，能实现view的缩放、旋转、平移等等功能。
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原文地址：http://my.oschina.net/zooyf/blog/495291
