iOS－UIView動畫
今天的主題是UIView的動畫。
在iOS中UIView的動畫是基於CALayer動畫封裝。
動畫就是靜態的圖片通過一定頻率顯示，給人們動畫的效果。
UIView動畫有基於類方法的實現和基於Block方法塊的實現。
一.UIView基於類方法的實現的使用
類方法列表：
@interface UIView(UIViewAnimation) + (void)beginAnimations:(NSString *)animationID context:(void *)context; // additional context info passed to will start/did stop selectors. begin/commit can be nested + (void)commitAnimations; // starts up any animations when the top level animation is commited // no getters. if called outside animation block, these setters have no effect. + (void)setAnimationDelegate:(id)delegate; // default = nil + (void)setAnimationWillStartSelector:(SEL)selector; // default = NULL. -animationWillStart:(NSString *)animationID context:(void *)context + (void)setAnimationDidStopSelector:(SEL)selector; // default = NULL. -animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context + (void)setAnimationDuration:(NSTimeInterval)duration; // default = 0.2 + (void)setAnimationDelay:(NSTimeInterval)delay; // default = 0.0 + (void)setAnimationStartDate:(NSDate *)startDate; // default = now ([NSDate date]) + (void)setAnimationCurve:(UIViewAnimationCurve)curve; // default = UIViewAnimationCurveEaseInOut + (void)setAnimationRepeatCount:(float)repeatCount; // default = 0.0. May be fractional + (void)setAnimationRepeatAutoreverses:(BOOL)repeatAutoreverses; // default = NO. used if repeat count is non-zero + (void)setAnimationBeginsFromCurrentState:(BOOL)fromCurrentState; // default = NO. If YES, the current view position is always used for new animations -- allowing animations to "pile up" on each other. Otherwise, the last end state is used for the animation (the default). + (void)setAnimationTransition:(UIViewAnimationTransition)transition forView:(UIView *)view cache:(BOOL)cache; // current limitation - only one per begin/commit block + (void)setAnimationsEnabled:(BOOL)enabled; // ignore any attribute changes while set. + (BOOL)areAnimationsEnabled; + (void)performWithoutAnimation:(void (^)(void))actionsWithoutAnimation NS_AVAILABLE_IOS(7_0); @end
1.+ (void)beginAnimations:(NSString *)animationID context:(void *)context;
該方法是動畫的起點，它總是和commitAnimation成對出現。
2.+ (void)commitAnimations
提交動畫，
其他的主要是用來設置動畫的代理，執行時間，延遲執行動畫，是否自動的重復，重復的次數等。下面是它們的使用。
-(void)classMethodAnimation{
[UIView beginAnimations:@"animation" context:nil];
//設置動畫重復次數
[UIView setAnimationRepeatCount:10.];
//開始動畫改變它的位置從originPoint（0，0）變味originPoint（100，100）
anim.frame = CGRectMake(100, 100, 50, 50);
//設置動畫曲線，也就是動畫效果
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
//設置動畫延遲
[UIView setAnimationDelay:4];
//設置動畫代理
[UIView setAnimationDelegate:self];
//設置動畫停止時的時間
[UIView setAnimationDidStopSelector:@selector(animationStop)];
//設置動畫執行時間
[UIView setAnimationDuration:10];
//設置動畫是否自動反轉
[UIView setAnimationRepeatAutoreverses:YES];
//設置動畫開始時調用的方法
[UIView setAnimationWillStartSelector:@selector(startAnimation)];
[UIView commitAnimations];
}
控制臺運行輸出結果：（主要是動畫代理方法的調用，動畫效果見demo）
2015-04-06 08:28:14.230 ViewAnimation[1299:49180] 動畫停止瞭-[ViewController startAnimation]
2015-04-06 08:28:16.227 ViewAnimation[1299:49180] 動畫停止瞭-[ViewController animationStop]
二.UIView動畫block方法
@interface UIView(UIViewAnimationWithBlocks) + (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); + (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); // delay = 0.0, options = 0 + (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations NS_AVAILABLE_IOS(4_0); // delay = 0.0, options = 0, completion = NULL + (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay usingSpringWithDamping:(CGFloat)dampingRatio initialSpringVelocity:(CGFloat)velocity options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(7_0); + (void)transitionWithView:(UIView *)view duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); + (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); // toView added to fromView.superview, fromView removed from its superview + (void)performSystemAnimation:(UISystemAnimation)animation onViews:(NSArray *)views options:(UIViewAnimationOptions)options animations:(void (^)(void))parallelAnimations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(7_0); @end
block的動畫效果就是把你想要改變的東西包含到block動畫塊中。
-(void)blockAnimation{
[UIView animateWithDuration:5 animations:^{
anim.frame = CGRectMake(100, 100, 50, 50);
}];
[UIView animateWithDuration:5 animations:^{
anim.frame = CGRectMake(200, 200, 50, 50);
anim.backgroundColor = [UIColor grayColor];
} completion:^(BOOL finished) {
NSLog(@"block animation complet operation");
}];
}
運行控制態輸出效果：
2015-04-06 08:33:49.944 ViewAnimation[1359:51632] block animation complet operation
兩個動畫小結：
通過block把動畫內容包含到block中實現動畫，使用beginAnimation和commitsAnimation函數對包含動畫，都是通過參數設置動畫的執行屬性。