延遲初始化 指標地址 NSTimer

很多東西 不總結 覺的有點不舒服 這裡mark下 

第一是延遲初始化 

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];

這裡把對象添加到數組中 也就是儲存指標的意思吧

    for (UINewsDetailPlayView *detailPlayView in self.buttonsArray) {        [detailPlayView.playButton setSelected:NO];//這樣遍曆 取出playButton 設定選中狀態    }

為什麼要這樣寫呢？因為遇到一個問題 手動的給一個button添加了事件 代碼如下

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

但是在playAudio中又聲明了一個NSTimer導致了 無法對PlayButton進行操作 代碼如下

-(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:@"緩衝逾時 請檢查網路資源是否可用"];    [[MMSPlayer sharedMMSPlayer] stop];    [self stopLoadingAnimation];    [timer release];}