添加毛玻璃的两中方法

[代码]objc代码：

?

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

#import "ViewController.h"   @interface ViewController () @property (nonatomic, weak) UIImageView *icon; @property (nonatomic, weak) UIToolbar *tool; @property (nonatomic, weak) UIVisualEffectView *vis; @end   @implementation ViewController   - (void)viewDidLoad {     [super viewDidLoad];     self.title = @"模糊效果";     UIButton *btn  = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 44, 44)];     [btn setTitle:@"模糊" forState:UIControlStateNormal];     [btn addTarget:self action:@selector(addBlurry:) forControlEvents:UIControlEventTouchUpInside];     [btn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btn];           UIImageView *icon = [[UIImageView alloc] initWithFrame:CGRectMake(0, 80, self.view.bounds.size.width, self.view.bounds.size.height - 100)];     icon.image = [UIImage imageNamed:@"bg"];     icon.contentMode = UIViewContentModeScaleAspectFit;     self.icon = icon;     [self.view addSubview:icon]; } -(void)addBlurry:(UIButton *)btn{     if(btn.selected){ //        [self.tool removeFromSuperview];         [self.vis removeFromSuperview];         btn.selected = NO;     }else{ //        [self addTools];         [self addBlurry];         btn.selected = YES;     } }

方法一：

[代码]objc代码：

?

1 2 3 4 5 6 7 8 9

/************** 方法一************/ -(void)addTools{     UIToolbar *tool = [[UIToolbar alloc] init];     tool.barStyle = UIBarStyleBlack;     tool.frame = CGRectMake(0, 0, self.icon.bounds.size.width, self.icon.bounds.size.height);     tool.alpha = 0.98;     self.tool = tool;     [self.icon addSubview:tool]; }

方法二：

[代码]objc代码：

?

01 02 03 04 05 06 07 08 09 10 11 12 13 14

/************** 方法二************/ -(void)addBlurry{     UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];     UIVisualEffectView *vis = [[UIVisualEffectView alloc] initWithEffect:blur];     /*注：尽量避免将UIVisualEffectView对象的alpha值设置为小于1.0的值，     因为创建半透明的视图会导致系统在离屏渲染时去对UIVisualEffectView对象      及所有的相关的子视图做混合操作。这不但消耗CPU/GPU，也可能会导致许多效果      显示不正确或者根本不显示。*/ //    vis.alpha = 0.9;     vis.frame = CGRectMake(0, 0, self.icon.bounds.size.width, self.icon.bounds.size.height);     self.vis = vis;     [self.icon addSubview:vis]; } @end