如何present出一个透明导航控制器NavigationController + UIVisualEffectView实现模糊效果、毛玻璃效果

在实际需求中使用模糊效果一般是： 原有界面（保持不变）+ 毛玻璃效果 + 需要展示的界面（上方）。

即：



1.新建工程 ，设置ViewController的背景图（淘宝首页截图），添加按钮及其事件

- (void)viewDidLoad {

[super viewDidLoad];

_imageView.frame = [UIScreen mainScreen].bounds;

UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.backgroundColor = [UIColor orangeColor];
btn.frame = CGRectMake(10, SCREEN_HEIGHT_NEW - 60, SCREEN_WIDTH_NEW - 10 * 2, 40);
[self.view addSubview:btn];
[btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
[btn setTitle:@"点击展示模糊" forState:UIControlStateNormal];

}

- (void)click:(UIButton*)btn{

MyTopViewController *topVC = [[MyTopViewController alloc]init];
UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:topVC];
//present出一个透明导航控制器NavigationController
navi.modalPresentationStyle = UIModalPresentationCustom;
[self presentViewController:navi animated:YES completion:^{}];

}

2在MyTopViewController中添加毛玻璃效果

- (void)viewDidLoad {
[super viewDidLoad];

//只有透明才能看到下方界面
self.view.backgroundColor = [UIColor clearColor];

//实现模糊效果
UIVisualEffectView *visualEffectView = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight]];

visualEffectView.frame = self.view.bounds;

visualEffectView.alpha = 0.88;

[self.view addSubview:visualEffectView];

UITextField *textFiled = [[UITextField alloc]initWithFrame:CGRectMake(20, 200, SCREEN_WIDTH_NEW - 20*2, 40)];
[self.view addSubview:textFiled];
textFiled.placeholder = @"请输入手机号";
textFiled.tintColor = [UIColor purpleColor];;
textFiled.layer.borderWidth = 1;
textFiled.layer.borderColor = [UIColor purpleColor].CGColor;

UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.backgroundColor = [UIColor orangeColor];
btn.frame = CGRectMake(10, 170 + 100, SCREEN_WIDTH_NEW - 10 * 2, 50);
[btn setTitle:@"下一步" forState:UIControlStateNormal];
[self.view addSubview:btn];
[btn addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];

}

-(void)click{
UIViewController *vc = [[UIViewController alloc]init];
vc.view.backgroundColor = [UIColor grayColor];
[self.navigationController pushViewController:vc animated:YES];
}

下载地址：http://download.csdn.net/detail/qq_15509071/9826691

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