iOS模糊效果的实现方法

- (void)viewDidLoad { [super viewDidLoad]; // 加载一张图片 UIImage *image = [UIImage imageNamed:@"che"]; /**************CoreImage部分**************/ // 1.创建CIImage CIImage *ciImage = [[CIImage alloc] initWithImage:image]; // 2.创建滤镜CIFilter CIFilter *blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"]; // 2.1.将CIImage输入到滤镜中 [blurFilter setValue:ciImage forKey:kCIInputImageKey]; // 可以通过该方法查看我们可以设置的值(如模糊度等) NSLog(@"%@", [blurFilter attributes]); // 2.2设置模糊度 [blurFilter setValue:@(2) forKey:@"inputRadius"]; // 2.3将处理好的图片输出 CIImage *outCiImage = [blurFilter valueForKey:kCIOutputImageKey]; // 3.CIContext(option参数为nil代表用CPU渲染,若想用GPU渲染请查看此参数) CIContext *context = [CIContext contextWithOptions:nil]; // 4.获取CGImage句柄 CGImageRef outCGImage = [context createCGImage:outCiImage fromRect:[outCiImage extent]]; // 5.获取最终的图片 UIImage *blurImage = [UIImage imageWithCGImage:outCGImage]; // 6.释放CGImage CGImageRelease(outCGImage); /*****************************************/ UIImageView *imageV = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 750 / 2, 1334 / 2)]; imageV.image = blurImage; imageV.center = self.view.center; [self.view addSubview:imageV];}

#import "ViewController.h"#import "UIImage+ImageEffects.h"- (void)viewDidLoad { [super viewDidLoad]; // 原始图片 UIImage *sourceImage = [UIImage imageNamed:@"che"]; // 对图片进行模糊处理 UIImage *blurImage = [sourceImage blurImageWithRadius:10]; // 加载模糊处理后的图片 UIImageView *imageV = [[UIImageView alloc] initWithImage:blurImage]; [self.view addSubview:imageV];}

#import "ViewController.h"@interface ViewController ()/** 背景 */@property (nonatomic, strong) UIScrollView *scrollView;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; // 添加展示的背景,用于显示动态模糊(背景能够滚动,便于查看动态的模糊) self.scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds]; UIImageView *imageV = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"fengjing"]]; self.scrollView.contentSize = imageV.image.size; self.scrollView.bounces = NO; [self.scrollView addSubview:imageV]; [self.view addSubview:self.scrollView]; /***************添加模糊效果***************/ // 1.创建模糊view UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]]; // 2.设定模糊View的尺寸 effectView.frame = CGRectMake(0, 100, 375, 200); // 3.添加到view当中 [self.view addSubview:effectView]; /******************添加显示文本******************/ UILabel *label = [[UILabel alloc] initWithFrame:effectView.bounds]; label.text = @"模糊效果"; label.font = [UIFont systemFontOfSize:40]; label.textAlignment = NSTextAlignmentCenter; /****************添加模糊效果的子view****************/ // 1.创建出子模糊view UIVisualEffectView *subEffectView = [[UIVisualEffectView alloc] initWithEffect:[UIVibrancyEffect effectForBlurEffect:(UIBlurEffect *)effectView.effect]]; // 2.设置子模糊view的尺寸 subEffectView.frame = effectView.bounds; // 3.将子模糊view添加到effectView的contentView上才能显示 [effectView.contentView addSubview:subEffectView]; // 4.添加要显示的view来达到特殊效果 [subEffectView.contentView addSubview:label];}@end