- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view.        //初始化背景图    [self initBackGroundView];    }#pragma -mark -functions//背景图-(void)initBackGroundView{    //人    UIImageView *loadPeopleView = [[UIImageView alloc] initWithFrame:CGRectMake(130, 100, 156, 172)];    loadPeopleView.tag = 101;    loadPeopleView.alpha = 1.0f;    loadPeopleView.backgroundColor=[UIColor clearColor];    [loadPeopleView setImage:[UIImage imageNamed:@"problem_load.png"]];        //花    UIImageView *loadFlowerView = [[UIImageView alloc] initWithFrame:CGRectMake(70, 200, 62, 75)];    loadFlowerView.tag = 102;    loadFlowerView.alpha = 1.0f;    [loadFlowerView setImage:[UIImage imageNamed:@"problem_load1.png"]];        [self.view addSubview:loadPeopleView];    [self.view addSubview:loadFlowerView];        timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(animation:) userInfo:nil repeats:YES];}//动画- (void)animation:(NSTimer *)timer{    NSLog(@"-i-%i--",i);    UIImageView *imageView = (UIImageView *)[self.view viewWithTag:102];    i++;    if (i%3 == 0) {        [imageView setImage:[UIImage imageNamed:@"problem_load1.png"]];    }else if (i%3 == 1){        [imageView setImage:[UIImage imageNamed:@"problem_load2.png"]];    }else{        [imageView setImage:[UIImage imageNamed:@"problem_load3.png"]];    }}