[代码]objc代码：
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#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：
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/************** 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：
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/************** 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 |