////  ViewController.m//  AnimationLineView////  Created by YouXianMing on 14/11/7.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "ViewController.h"#import "YXGCD.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // layer    CALayer *layer        = [CALayer layer];    layer.frame           = CGRectMake(100, 100, 3, 3);    layer.backgroundColor = [UIColor redColor].CGColor;    layer.delegate        = self;    [self.view.layer addSublayer:layer];        // 动画    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"bounds"];    animation.fromValue         = [NSValue valueWithCGRect:layer.frame];    animation.toValue           = [NSValue valueWithCGRect:CGRectMake(100, 100, 100, 3)];    animation.duration          = 3.f;    animation.delegate          = self;                   // 设置代理    [layer addAnimation:animation forKey:@"YouXianMing"]; // 添加动画        // 暂停动画    [GCDQueue executeInMainQueue:^{        [self pauseLayer:layer];    } afterDelaySecs:1.5f];        // 恢复动画    [GCDQueue executeInMainQueue:^{        [self resumeLayer:layer];    } afterDelaySecs:3.f];        // 移除动画(根据key值)    [GCDQueue executeInMainQueue:^{        [layer removeAnimationForKey:@"YouXianMing"];    } afterDelaySecs:3.5f];}/** *  动画确实停止了 * *  @param anim CAAnimation对象 *  @param flag 是否是正常的移除 */- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {    NSLog(@"动画:%@ 是否动画中途被移除了:%d", anim, flag);}/** *  暂停 * *  @param layer 被停止的layer */-(void)pauseLayer:(CALayer*)layer{    CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];    layer.speed               = 0.0;    layer.timeOffset          = pausedTime;}/** *  恢复 * *  @param layer 被恢复的layer */-(void)resumeLayer:(CALayer*)layer{    CFTimeInterval pausedTime     = [layer timeOffset];    layer.speed                   = 1.0;    layer.timeOffset              = 0.0;    layer.beginTime               = 0.0;    CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;    layer.beginTime               = timeSincePause;}@end