- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 NSArray* guideImages = @[@"welcomePage_1",@"welcomePage_2",@"welcomePage_3"];
 AppInstructionView* guide = [[AppInstructionView alloc]initWithFrame:CGRectMake(0, 0, ScreenWidth, ScreenHeight)];
 guide.guideImages = guideImages;
 [guide rewritePageControl];
 [self.window.rootViewController.view addSubview:guide];
 return YES;
}

#pragma mark - 重写pageControl方法
-(void)rewritePageControl{

 _pc = [[CHPageControl alloc]initWithFrame:CGRectMake(_pageSize.width * 0.5, _pageSize.height - 50, 0,0) currentColor:COLOR(72.0, 160.0, 220.0, 1) nextColor:COLOR(99.0, 99.0, 99.0, 1) size:8];
 [_pc setBackgroundColor:[UIColor clearColor]];
 _pc.userInteractionEnabled=NO;
 [_pc setCurrentPage:0];
 [_pc setNumberOfPages:_guideImages.count];

 [self addSubview:_pc];
}