iOS開發之手勢交互

    //全部直接或者間接繼承自UIResponder(就是繼承自UIView和UIViewController的

    //類),均可以去重寫UITouch的相關方法,去檢查開始觸摸，結束觸摸以及移動等事件

#import "AppDelegate.h"

#import "FJViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Override point for customization after application launch.

    

     _window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

    

    [_window setBackgroundColor:[UIColor whiteColor]];

    

    

    //全部直接或者間接繼承自UIResponder(就是繼承自UIView和UIViewController的

    //類),均可以去重寫UITouch的相關方法,去檢查開始觸摸，結束觸摸以及移動等事件

    

    //=========================================

    

    FJViewController *viewc = [[FJViewController alloc]init];

    _window.rootViewController = viewc;

    

    

    [_window makeKeyAndVisible];

    

    return YES;

}

@end

---

FJLabel.m

#import "FJLabel.h"

@implementation FJLabel

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

    

    

    

    UITouch *touch = [touches anyObject];

    

    CGPoint point = [touch locationInView:self.superview];

    

    //label跟着移動，從新設置當前label的座標

    self.center = point;

    

    

}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{

    

    [UIView animateWithDuration:0.01 animations:^{

        

        self.transform = CGAffineTransformMakeScale(0, 0) ;

        

    }];

}

@end

---

FJViewController.m

#import "FJLabel.h"

#import "FJViewController.h"

@interface FJViewController (){

    UITextField *field;

    UIImageView *imageView;

}

@end

@implementation FJViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    

    //設置背景顏色

    self.view.backgroundColor = [UIColor redColor];

    

    //UITouch的應用:點擊屏幕任何其餘的地方收起鍵盤

    //重寫touchBegain方法在這個方法中收起鍵盤

    

   field = [[UITextField alloc]initWithFrame:CGRectMake(100, 100, 200, 100)];

    field.backgroundColor = [UIColor whiteColor];

    [self.view addSubview:field];

    

#pragma mark - UITouch在視圖控制器中拖動一個視圖

    

    

    imageView  = [[UIImageView alloc]

                              initWithFrame:CGRectMake(100, 250, 50, 50)];

    

    imageView.backgroundColor = [UIColor cyanColor];

    [self.view addSubview:imageView];

    

    

#pragma mark -UITouch移動一個label

    

    FJLabel *lable= [[FJLabel alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];

    lable.text = @"hello world";

    lable.userInteractionEnabled = YES;

    [self.view addSubview:lable];

    

}

#pragma mark UITouch的基本知識

//開始觸摸當前視圖的時候調用這個方法

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

    

     //NSSet

    //參數1:當前的觸摸對象集合:NSSet的功能和數組基本同樣用來同時存儲多個對象

    //和數組的區別是:NSArray中的數組元素是有序的，可是NSSet中的元素是無序的

    

    //參數2:事件

    //1.拿到當前的觸摸對象

    UITouch *touch = [touches anyObject];

    

    //2.拿到當前觸摸的座標

    CGPoint point = [touch locationInView:self.view];

    

    NSLog(@"%@",NSStringFromCGPoint(point));

    

    //3.拿到當前全部的觸摸點(可能同時拿到多個觸摸對象)

    NSSet *set = event.allTouches;

    //4.只能經過forin去遍歷(多個手指同時觸摸)

    for (UITouch *tTouch in set) {

        

        CGPoint point = [tTouch locationInView:self.view];

        NSLog(@"%@",NSStringFromCGPoint(point));

    }

    

    

    NSLog(@"開始觸摸");

#pragma mark - UITouch的應用

    //==================UITouch的應用:收起鍵盤=======================

    [field resignFirstResponder];

    

    //==================應用二:拖動視圖==============

    

    imageView.center = point;

}

//觸摸結束調用方法

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{

    

    NSLog(@"觸摸結束");

    //拿到觸摸結束時得touch對象

    UITouch *touch = [touches anyObject ];

    //拿到觸摸結束的座標

    CGPoint point = [touch locationInView:self.view];

    NSLog(@"%@",NSStringFromCGPoint(point));

    

    

}

//這方法會在手指按住不放的過程當中時時調用

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

    

    NSLog(@"移動");

    UITouch *touch = [touches anyObject];

    CGPoint point = [touch locationInView:self.view];

    //==================應用二:拖動視圖==============

    imageView.center = point;

    

    

    NSLog(@"%@",NSStringFromCGPoint(point));

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end