iOS動畫效果和實現

動畫效果提供了狀態或頁面轉換時流暢的使用者體驗，在iOS系統中，咱們不需要自己編寫繪製動畫的代碼，Core Animation提供了豐富的api來實現你需要的動畫效果。    UIKit只用UIView來展示動畫,動畫支援UIView下面的這些屬性改變：frame  bounds  center  transform  alpha backgroundColor contentStretch 1、commitAnimations方式使用UIView動畫[cpp] - (void)viewDidLoad  {      [super viewDidLoad];            UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];            [button setTitle:@"改變" forState:UIControlStateNormal];      button.frame = CGRectMake(10, 10, 60, 40);      [button addTarget:self action:@selector(changeUIView) forControlEvents:UIControlEventTouchUpInside];      [self.view addSubview:button];        }    - (void)changeUIView{      [UIView beginAnimations:@"animation" context:nil];      [UIView setAnimationDuration:1.0f];      [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];      [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];      [UIView commitAnimations];   }   下面是點擊改變後的效果（兩種）： 動畫的常量有一下四種[cpp]  UIViewAnimationTransitionNone,  UIViewAnimationTransitionFlipFromLeft,  UIViewAnimationTransitionFlipFromRight,  UIViewAnimationTransitionCurlUp,  UIViewAnimationTransitionCurlDown,   1.2 交換本視圖控制器中2個view位置 [self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:0];先添加兩個view ,一個r view plaincopy- (void)viewDidLoad  {      [super viewDidLoad];      UIView *redView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];      redView.backgroundColor = [UIColor redColor];      [self.view addSubview:redView];            UIView *yellowView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];      yellowView.backgroundColor = [UIColor yellowColor];      [self.view addSubview:yellowView];            UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];      [button setTitle:@"改變" forState:UIControlStateNormal];      button.frame = CGRectMake(10, 10, 300, 40);      [button addTarget:self action:@selector(changeUIView) forControlEvents:UIControlEventTouchUpInside];      [self.view addSubview:button];            UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];      [button1 setTitle:@"改變1" forState:UIControlStateNormal];      button1.frame = CGRectMake(10, 60, 300, 40);      [button1 addTarget:self action:@selector(changeUIView1) forControlEvents:UIControlEventTouchUpInside];      [self.view addSubview:button1];        }   [cpp] - (void)changeUIView1{      [UIView beginAnimations:@"animation" context:nil];      [UIView setAnimationDuration:1.0f];      [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];      [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view cache:YES];      //  交換本視圖控制器中2個view位置      [self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:0];      [UIView commitAnimations];  }   這樣看起來就像兩頁一樣了。1.3 、   [UIView setAnimationDidStopSelector:@selector(animationFinish:)];在commitAnimations訊息之前，可以設定動畫完成後的回調，設定方法是：    [UIView setAnimationDidStopSelector:@selector(animationFinish:)]; 2、使用：CATransition[cpp] - (void)changeUIView2{      CATransition *transition = [CATransition animation];      transition.duration = 2.0f;        transition.type = kCATransitionPush;      transition.subtype = kCATransitionFromTop;      [self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:0];      [self.view.layer addAnimation:transition forKey:@"animation"];  }  transition.type 的類型可以有淡化、推擠、揭開、覆蓋NSString * const kCATransitionFade;NSString * const kCATransitionMoveIn;NSString * const kCATransitionPush;NSString * const kCATransitionReveal;這四種，transition.subtype 也有四種NSString * const kCATransitionFromRight;NSString * const kCATransitionFromLeft;NSString * const kCATransitionFromTop;NSString * const kCATransitionFromBottom;  2.2 私人的類型的動畫類型：立方體、吸收、翻轉、波紋、翻頁、反翻頁、鏡頭開、鏡頭關[cpp]  animation.type = @"cube"  animation.type = @"suckEffect";    animation.type = @"oglFlip";//不管subType is "fromLeft" or "fromRight",official只有一種效果  animation.type = @"rippleEffect";   animation.type = @"pageCurl";   animation.type = @"pageUnCurl"  animation.type = @"cameraIrisHollowOpen ";  animation.type = @"cameraIrisHollowClose ";  是第一個cube立方體的效果：2.3 CATransition的 startProgress  endProgress屬性這兩個屬性是float類型的。可以控制動畫進行的過程，可以讓動畫停留在某個動畫點上，值在0.0到1.0之間。endProgress要大於等於startProgress。比如上面的立方體轉到，可以設定endProgress= 0.5，讓動畫停留在轉動一般的位置。上面這些私人的動畫效果，在實際應用中要謹慎使用。因為在app store審核時可能會以為這些動畫效果而拒絕通過。  3、UIView的 + (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion方法。這個方法是在iOS4.0之後才支援的。比 1 裡的UIView的方法簡潔方便使用。DidView裡添加moveView。[cpp]  moveView = [[UIView alloc] initWithFrame:CGRectMake(10, 180, 200, 40)];  moveView.backgroundColor = [UIColor blackColor];  [self.view addSubview:moveView];  [cpp]  - (void)changeUIView3{      [UIView animateWithDuration:3 animations:^(void){          moveView.frame = CGRectMake(10, 270, 200, 40);      }completion:^(BOOL finished){          UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 40, 40)];          label.backgroundColor = [UIColor blackColor];          [self.view addSubview:label];      }];  }  然後用UIView animateWithDuration動畫移動，移動動畫完畢後添加一個Label。3.2、 animateWithDuration的嵌套使用[cpp]  - (void)changeUIView3{               [UIView animateWithDuration:2                            delay:0                          options:UIViewAnimationOptionCurveEaseOut animations:^(void){          moveView.alpha = 0.0;      }completion:^(BOOL finished){          [UIView animateWithDuration:1                                delay:1.0                              options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat                           animations:^(void){                               [UIView setAnimationRepeatCount:2.5];                               moveView.alpha = 1.0;                           }completion:^(BOOL finished){                                                          }];                }];  }  這個嵌套的效果是先把view變成透明，在從透明變成不透明，重複2.5次透明到不透明的效果。