Question

在Xcode 4.3.2中使用Obj.-c for iPhone 5.1;我创建了一个CALayers数组，所有这些都来自同一个图像。然后，我希望通过CATransactions分组，同时将CABasicAnimation应用于阵列中的每个CALayer。这一切都有效。但是，我想重复调用CATransactions中包含的CABasicAnimations块，但是每次同时执行块时都能够单独修改每个动画的属性。例如，我有动画的值，我想每次为每个图层上的动画随机更改动画。因为我想重复相同的基本动画，但要进行属性修改;将动画的repeatCount属性设置为某个高值将无效。我尝试在makeSwarm方法中使用for循环重复调用animate方法，使用animationDidStop引发另一个animate方法调用但最终发生的是新调用是使用CATransaction块而不是在最后，并且还有方法调用本身（在animate方法的末尾放置[self animate];）;这一切都不起作用。这是基本代码。我认为这很简单，但我没有看到重要的事情。谢谢，塞思

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

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

我相信我已经为自己回答了这个问题。我在循环结束时设置了动画的委托（当i == 2时），当动画结束时（指示循环结束），然后从animationDidStop方法我再次调用方法动画。如果有一个比这更优雅或无故障的解决方案，我会全神贯注并接受它作为答案。

如何循环CATransaction块中包含的几个CABasicAnimations？

1 个答案: