學習UI編程已經有三四天了，這幾天學習了一些初級的視圖和控件，比如UIView,UIlabel以及UIButton.，學習UI編程,有一點樂趣就是自己寫的代碼可以看到效果了。這一點和C語言以及OC區別很大。於是我就嘗試做了一個簡單視圖顏色變換的應用，也就是霓虹燈。實現的功能可以由裡而外，也可以由外到裡，還可以暫停。由於水平有限，再加上還沒有學習NSTimer，只是從網上了解到了簡單地應用，所以代碼實現上可能會有些問題，算法不是最優的，還望大神們批評指點。貼上一張截圖：

vcnPtPrC68q1z9ajujwvcD4KPHA+PC9wPgo8cHJlIGNsYXNzPQ=="brush:java;">#import "ZZAppDelegate.h" @interface ZZAppDelegate () { UIView *_containerView; NSTimer *_timer; } @end @implementation ZZAppDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. self.window.backgroundColor = [UIColor grayColor]; _containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)]; _containerView.backgroundColor = [UIColor clearColor]; [self.window addSubview:_containerView]; [_containerView release]; // 視圖布局 NSArray *array = [NSArray arrayWithObjects:[UIColor redColor], [UIColor orangeColor], [UIColor yellowColor], [UIColor greenColor], [UIColor blueColor], [UIColor cyanColor], [UIColor purpleColor], nil]; for (int i = 0; i < 7; i++) { UIView *view = [[UIView alloc] initWithFrame:CGRectMake(20 + i * 20, 120 + i * 20, 280 - i * 40, 280 - i * 40)]; view.backgroundColor = array[i]; view.tag = i + 200; NSLog(@"%ld", (long)view.tag); [_containerView addSubview:view]; [view release]; } // 創建由內而外按鈕 UIButton *button1 = [UIButton buttonWithType:UIButtonTypeSystem ]; button1.frame = CGRectMake(40, 450, 70, 40); button1.backgroundColor = [UIColor cyanColor]; [button1 setTitle:@"由內而外" forState:UIControlStateNormal]; [button1 addTarget:self action:@selector(changeFromInToOut) forControlEvents:UIControlEventTouchUpInside]; button1.layer.cornerRadius = 7; [_containerView addSubview:button1]; // 創建停止按鈕 UIButton *button2 = [UIButton buttonWithType:UIButtonTypeSystem ]; button2.frame = CGRectMake(125, 450, 70, 40); button2.backgroundColor = [UIColor cyanColor]; [button2 setTitle:@"停止" forState:UIControlStateNormal]; [button2 addTarget:self action:@selector(stop) forControlEvents:UIControlEventTouchUpInside]; button2.layer.cornerRadius = 7; [_containerView addSubview:button2]; // 創建由外而內按鈕 UIButton *button3 = [UIButton buttonWithType:UIButtonTypeSystem ]; button3.frame = CGRectMake(210, 450, 70, 40); button3.backgroundColor = [UIColor cyanColor]; [button3 setTitle:@"由外而內" forState:UIControlStateNormal]; [button3 addTarget:self action:@selector(changeFromOutToIn) forControlEvents:UIControlEventTouchUpInside]; button3.layer.cornerRadius = 7; [_containerView addSubview:button3]; [self.window makeKeyAndVisible]; return YES; } // 由內而外按鈕觸發事件 - (void)changeFromInToOut { _timer = [NSTimer scheduledTimerWithTimeInterval:0.3 target:self selector:@selector(changeInToOut) userInfo:nil repeats:YES]; } // 由外而內按鈕出觸發事件 - (void)changeFromOutToIn { _timer = [NSTimer scheduledTimerWithTimeInterval:0.3 target:self selector:@selector(changeOutToIn) userInfo:nil repeats:YES]; } // 暫停計時器 - (void)stop { [_timer invalidate]; } // 由內而外循環交換顏色 - (void)changeInToOut { UIView *temp = [[UIView alloc] init]; int i = 200; temp.backgroundColor = [_containerView viewWithTag:200].backgroundColor; for (i = 200; i < 207; i++) { [_containerView viewWithTag:i].backgroundColor = [_containerView viewWithTag: i + 1].backgroundColor; } [_containerView viewWithTag:206].backgroundColor =temp.backgroundColor; [temp release]; } // 由外而內循環交換顏色 - (void)changeOutToIn { UIView *temp = [[UIView alloc] init]; int i = 206; temp.backgroundColor = [_containerView viewWithTag:206].backgroundColor; for (i = 206; i >= 0; i--) { [_containerView viewWithTag:i].backgroundColor = [_containerView viewWithTag: i - 1].backgroundColor; } [_containerView viewWithTag:200].backgroundColor =temp.backgroundColor; [temp release]; } - (void)dealloc { [_window release]; [super dealloc]; } @end