iOS8使用UIVisualEffectView实现模糊效果

- (void)viewDidLoad { 

    [super viewDidLoad]; 

    // Do any additional setup after loading the view, typically from a nib. 

    //使用图片初始化背景色 

    self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"gradient2"]]; 

    //实现模糊效果 

    UIVisualEffectView *visualEffectView = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]]; 

    visualEffectView.frame = self.view.bounds; 

    visualEffectView.alpha = 1.0; 

    [self.view addSubview:visualEffectView]; 

}