CABasicAnimation 几种停止的回调

一、编写一个简单的动画，使一个UIview从屏幕的左上角移动到左下角，间隔时间3S

//
//  ViewController.m
//  CAAnimationTest
//
//  Created by on 15-10-27.
//  Copyright (c) 2015年 va. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIView *aniView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    _aniView = [[UIView alloc] initWithFrame:CGRectMake(, , , )];
    _aniView.backgroundColor = [UIColor yellowColor];
//    [self.view addSubview:_aniView];

    UIView *backView = [[UIView alloc] initWithFrame:self.view.bounds];
    backView.backgroundColor = [UIColor greenColor];
    [self.view addSubview:backView];
    [backView addSubview:_aniView];

    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];
    animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(, )];
    animation.toValue = [NSValue valueWithCGPoint:CGPointMake(CGRectGetWidth(self.view.bounds) - , CGRectGetHeight(self.view.bounds) - )];
    animation.duration = ;
    animation.removedOnCompletion = NO;
    animation.fillMode = kCAFillModeForwards;
    animation.delegate = self;

    [_aniView.layer addAnimation:animation forKey:@"testAni"];

}

- (void)animationDidStart:(CAAnimation *)anim
{
    NSLog(@"animation start , aniView = %@", _aniView);
}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
{
    NSLog(@"animation stop : flag = %d , aniView = %@", flag, _aniView);

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

效果：

二、动画中断的几种情况

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

        [_aniView removeFromSuperview];

    });

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{        [backView removeFromSuperview];
    });

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{        [_aniView.layer removeAllAnimations];
    });

以上三种情况都会回调下面的方法

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag

输出：

2015-10-28 01:08:19.330 CAAnimationTest[3615:6005077] animation start , aniView = <UIView: 0x7fe47b5308b0; frame = (0 0; 100 100); animations = { testAni=<CABasicAnimation: 0x7fe47b534020>; }; layer = <CALayer: 0x7fe47b530980>>

2015-10-28 01:08:37.300 CAAnimationTest[3615:6005077] animation stop : flag = 1 , aniView = <UIView: 0x7fe47b5308b0; frame = (0 0; 100 100); animations = { testAni=<CABasicAnimation: 0x7fe47b534020>; }; layer = <CALayer: 0x7fe47b530980>>

三、动画暂停

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

CFTimeInterval pausedTime = [_aniView.layer convertTime:CACurrentMediaTime() fromLayer:nil];

_aniView.layer.speed = 0.0;

_aniView.layer.timeOffset = pausedTime;

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(15 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

CFTimeInterval pausedTime = [_aniView.layer timeOffset];

_aniView.layer.speed = 1.0;

_aniView.layer.timeOffset = 0.0;

_aniView.layer.beginTime = 0.0;

CFTimeInterval timeSincePause = [_aniView.layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;

_aniView.layer.beginTime = timeSincePause;

});

});

这里的pauseTime是动画已经运动的时间间隔，暂停一段时间之后想回复，那么就相当于从当前时间点的 －pauseTime开始动画。