本文是背景虚化界面设计，在美图秀秀的背景虚化模块主要是图像的模糊处理，可以按照圆形和线性进行模糊处理，并生成选定的形状。

　　在开发中遇到的误区

1.模糊形状使用UIImageView，遇到一些麻烦，即使你向UIImageView对象添加手势，当你重载touchesBegan时，UIImageView对象也接收不到触摸事件，而是直接传递给self.view。所以最后使用了UIButton来显示模糊形状图片，这样方便我们接收事件。

2.UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];初始化时用UIButtonTypeCustom才可以显示原图片，否则显示图片时时高亮状态的图片，很是奇怪。

如图

先来几张效果图

　　

 

一、从美化图片首页进入背景虚化

    else if ([text isEqualToString:@"背景虚化"]) { FWBlurViewController *vc = [[FWBlurViewController alloc] initWithImage:self.image]; [self presentViewController:vc animated:YES completion:^{ }]; }

 

二、初始化界面

self.selectedIndex = 0; self.view.backgroundColor = [UIColor blackColor]; //显示图片
    self.imageView = [[UIImageView alloc] initWithImage:self.image]; self.imageView.frame = CGRectMake(0, 0, WIDTH, HEIGHT - 115); self.imageView.contentMode = UIViewContentModeScaleAspectFit; [self.view addSubview:self.imageView]; //保存与取消按钮的添加
    UIImage *i1 = [UIImage imageNamed:@"btn_cancel_a@2x.png"]; self.btnClose = [UIButton buttonWithType:UIButtonTypeCustom]; [self.btnClose setImage:i1 forState:UIControlStateNormal]; self.btnClose.frame = CGRectMake(20, HEIGHT - kCancelHeight - 10, kCancelHeight, kCancelHeight); [self.btnClose addTarget:self action:@selector(btnCancelOrSaveClicked:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:self.btnClose]; UIImage *i2 = [UIImage imageNamed:@"btn_ok_a@2x.png"]; self.btnSave = [UIButton buttonWithType:UIButtonTypeCustom]; [self.btnSave setImage:i2 forState:UIControlStateNormal]; self.btnSave.frame = CGRectMake(WIDTH - kCancelHeight - 20, HEIGHT - kCancelHeight - 10, kCancelHeight, kCancelHeight); [self.view addSubview:self.btnSave]; [self.btnSave addTarget:self action:@selector(btnCancelOrSaveClicked:) forControlEvents:UIControlEventTouchUpInside]; [self setupSlider]; self.styleBar = [[FWEffectBar alloc] initWithFrame:CGRectMake(90, HEIGHT - 55, 180, 55)]; NSDictionary *autoDict = [[FWDataManager getDataSourceFromPlist] objectForKey:@"Blur"]; NSArray *normalImageArr = [autoDict objectForKey:@"normalImages"]; NSArray *hightlightedImageArr = [autoDict objectForKey:@"HighlightedImages"]; NSArray *textArr = [autoDict objectForKey:@"Texts"]; NSMutableArray *items = [[NSMutableArray alloc] initWithCapacity:0]; for (int i = 0; i < [textArr count]; i++) { FWEffectBarItem *item = [[FWEffectBarItem alloc] initWithFrame:CGRectZero]; [item setFinishedSelectedImage:[UIImage imageNamed:[hightlightedImageArr objectAtIndex:i]] withFinishedUnselectedImage:[UIImage imageNamed:[normalImageArr objectAtIndex:i]] ]; item.title = [textArr objectAtIndex:i]; [items addObject:item]; } self.styleBar.items = items; self.styleBar.effectBarDelegate = self; [self.styleBar setSelectedItem:[self.styleBar.items objectAtIndex:0]]; [self effectBar:self.styleBar didSelectItemAtIndex:0]; [self.view addSubview:self.styleBar]; self.btnBlurType = [UIButton buttonWithType:UIButtonTypeCustom]; [self.btnBlurType setImage:[UIImage imageNamed:@"icon_blur_null"] forState:UIControlStateNormal]; [self.btnBlurType addTarget:self action:@selector(btnBlurClicked:) forControlEvents:UIControlEventTouchUpInsid