如何循環包含在CATransaction塊中的幾個CABasicAnimations？

Question

在Xcode 4.3.2中使用iPhone 5.1的Obj.-c;我創建了一組CALayers，全部來自同一圖像。然後我希望通過CATransactions進行分組，同時將CABasicAnimation應用於陣列中的每個CALayer。這一切都有效。但是，我想重複調用CATransactions中包含的CABasicAnimations塊，但每次同時執行塊時，都可以單獨修改每個動畫的屬性。舉例來說，我從每個層次上的動畫每次隨機更改動畫的值和值。因爲我想重複相同的基本動畫，但是需要修改屬性;將動畫的repeatCount屬性設置爲某個較高的值將不起作用。我嘗試過使用makeSwarm方法中的for循環重複調用animate方法，使用animationDidStop引發另一個動畫方法調用，但最終發生的是新調用使用CATransaction塊創建，而不是在最後，並且也有方法調用自己（put [self animate];在animate方法結束時）;並且這些都不起作用。這是基本的代碼。我認爲這很簡單，但我沒有看到重要的東西。謝謝，塞思

的ViewController.h

#import <QuartzCore/QuartzCore.h> 
#import <UIKit/UIKit.h> 

@interface ViewController : UIViewController{ 
    UIImage *beeImage; 

    UIImageView *beeView; 
    CALayer *beeLayer; 
    CABasicAnimation *animat; 
    NSMutableArray *beeArray; 
    NSMutableArray *beeanimArray; 

} 

@property(retain,nonatomic) UIImage *beeImage; 
@property(retain,nonatomic) NSMutableArray *beeArray; 
@property(retain,nonatomic) NSMutableArray *beeanimArray; 
@property(retain,nonatomic) UIImageView *beeView; 
@property(retain,nonatomic) CALayer *beeLayer; 
@property(retain,nonatomic)CABasicAnimation *animat; 
-(void) animate; 
-(void) makeSwarm; 


@end 

的ViewController.m

-(void) makeSwarm{ 

    self.view.layer.backgroundColor = [UIColor orangeColor].CGColor; 
    self.view.layer.cornerRadius = 20.0; 
    self.view.layer.frame = CGRectInset(self.view.layer.frame, 20, 20); 

    CGRect beeFrame; 
    beeArray = [[NSMutableArray alloc] init]; 
    beeImage = [UIImage imageNamed:@"bee50x55px.png"]; 
    beeFrame = CGRectMake(0, 0, beeImage.size.width, beeImage.size.height); 


    int i; 

    CALayer *p = [[CALayer alloc] init]; 


    for (i = 0; i < 3; i++) { 



     beeView = [[UIImageView alloc] initWithFrame:beeFrame]; 
     beeView.image = beeImage;  
     beeLayer = [beeView layer]; 
     [beeArray addObject: beeLayer]; 


     p = [beeArray objectAtIndex: i];  

     [p setPosition:CGPointMake(arc4random()%320, arc4random()%480)]; 
     [self.view.layer addSublayer:p]; 



    } 



    [self animate]; 

} 

-(void)animate 
{ 
    //the code from here to the end of this method is what I would like to repeat as many times as I would like 
    [CATransaction begin]; 

    int i; 
    for (i = 0; i < 3; i++) { 

     animat = [[CABasicAnimation alloc] init]; 
     [animat setFromValue:[NSValue valueWithCGPoint:CGPointMake(arc4random()%320, arc4random()%480)]]; 
     animat.toValue = [NSValue valueWithCGPoint:CGPointMake(arc4random()%320, arc4random()%480)]; 
     [animat setFillMode:kCAFillModeForwards]; 
     [animat setRemovedOnCompletion:NO]; 
     animat.duration=1.0; 


     CALayer *p = [[CALayer alloc] init]; 
     p = [beeArray objectAtIndex: i]; 
     [p addAnimation:animat forKey:@"position"]; 



    }  

    [CATransaction commit];  


} 

Answer 1

我相信我已經回答了這個自己。我在循環結束時設置動畫的委託（當我== 2），當動畫結束（指示循環結束），然後從animationDidStop方法，然後再次調用方法動畫。如果有比這更優雅或者無故障的解決方案，我會全神貫注，並且會接受它作爲答案。