延迟初始化指针地址 NSTimer_-、-:迟点,:s :690:-优快云博客

本文链接：https://blog.youkuaiyun.com/Mideveloper/article/details/8112618

本文介绍了Objective-C中使用延迟初始化来优化内存管理的方法，并通过一个具体的例子展示了如何实现这一技术。文章还探讨了延迟初始化在解决特定问题时的应用场景。

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很多东西不总结觉的有点不舒服这里mark下

第一是延迟初始化

首先

@property (retain, nonatomic) NSMutableArray *buttonsArray;

@synthesize buttonsArray;

//mark code
-(NSMutableArray*)buttonsArray{
    if (!buttonsArray) {
        buttonsArray = [[NSMutableArray alloc] init];
    }
    return buttonsArray;
}

UINewsDetailPlayView * newsDetailPlayView =[[UINewsDetailPlayView alloc] initFromNib];
[self.buttonsArray addObject:newsDetailPlayView];

这里把对象添加到数组中也就是保存指针的意思吧

    for (UINewsDetailPlayView *detailPlayView in self.buttonsArray) {
        [detailPlayView.playButton setSelected:NO];//这样遍历 取出playButton 设置选中状态
    }

为什么要这样写呢？因为遇到一个问题手动的给一个button添加了事件代码如下

[newsDetailPlayView.playButton addTarget:self action:@selector(playAudio:) forControlEvents:UIControlEventTouchUpInside];

但是在playAudio中又声明了一个NSTimer导致了无法对PlayButton进行操作代码如下

-(void)playAudio:(UIButton *)button
{
    int audioFlag = button.tag - PLAY_BUTTON_ROOT_TAG;
    NSArray *list = [self.newsData.programaMedia componentsSeparatedByString:@","];
    NSString *mediaUrl = [list objectAtIndex:audioFlag];
    if (button.selected) {
        [[MMSPlayer sharedMMSPlayer] stop];
        [button setSelected:NO];
        isPlaying = false;
    }else{
        [self startLoadingAnimation];
        [[MMSPlayer sharedMMSPlayer] play:mediaUrl];
        [button setSelected:YES];
        isPlaying = true;
        
        //mark code
        [[NSTimer scheduledTimerWithTimeInterval: 10
                                          target: self
                                        selector: @selector(handleTimer:)
                                        userInfo: nil
                                         repeats: NO]retain];
    }
}

-(void)handleTimer:(NSTimer *)timer{
    //mark code
    for (UINewsDetailPlayView *detailPlayView in self.buttonsArray) {
        [detailPlayView.playButton setSelected:NO];
    }
    [AlertUtils alertWithMessage:@"缓冲超时 请检查网络资源是否可用"];
    [[MMSPlayer sharedMMSPlayer] stop];
    [self stopLoadingAnimation];
    [timer release];
}