UIVisualEffectView(自定义模糊视图)

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIScrollView *scrollView;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    

    //添加SCrollView,把图片添加上去便于观察

    self.scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];

    UIImageView *imageView  = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"qiaodan"]];

    

    self.scrollView.contentSize = imageView.image.size;

    self.scrollView.bounces = NO;//回弹效果

    

    [self.scrollView addSubview:imageView];

    [self.view addSubview:self.scrollView];

    

    //设置模糊图层

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

    //设置模糊范围尺寸，自由设置 模糊的 范围

    effectView.frame = CGRectMake(0, 100, 375, 300);

    //添加到view

    [self.view addSubview:effectView];

    

    //可以在模糊图层上面添加内容：比如文字 等

    //上面还可以添加模糊图层 子模糊图层

    UILabel *label = [[UILabel alloc] initWithFrame:effectView.bounds];

    label.text = @"乔丹";

    label.textAlignment = NSTextAlignmentCenter;

    label.font = [UIFont systemFontOfSize:50.f];

//    [effectView.contentView addSubview:label];//1效果：添加到第一个模糊视图上面 ，字体部分会有  实体透明的效果

    

    //设置子模糊视图

    UIVisualEffectView *subEffectView = [[UIVisualEffectView alloc] initWithEffect:[UIVibrancyEffect effectForBlurEffect:(UIBlurEffect *)effectView.effect]];

    subEffectView.frame = effectView.bounds;

    

    [effectView.contentView addSubview:subEffectView];

    [subEffectView.contentView addSubview:label];//2效果：这个字体 的部分会有 模糊的效果

    

    

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

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end