写了一个很简单的，一个圆环闪烁的控件，用于自己gps定位

效果：

代码：

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

    CircleFlashView* view = [[CircleFlashView alloc]initWithFrame:CGRectMake(100, 100, 40, 40)];

    [view setBackgroundColor:[UIColor clearColor]];

    [self.view addSubview:view];

    [view release];

    

       

}

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