iOS8 CIGlassDistortion滤镜的使用

此为CoreImage滤镜的使用

素材

效果

混合用图片

源码：

////  ViewController.m//  CIGlass////  Created by XianMingYou on 15/3/15.//  Copyright (c) 2015年 XianMingYou. All rights reserved.//#import "ViewController.h"@interface ViewController ()@property (nonatomic, strong) UIImage *orgImage;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];        // 设置背景色    self.view.backgroundColor = [UIColor blackColor];            self.orgImage = [UIImage imageNamed:@"bg.png"];            // 数据源 + 设置    CIImage *ciImage = [[CIImage alloc] initWithImage:self.orgImage];    NSDictionary *params = @{                             kCIInputImageKey: ciImage,                             };        // 初始化滤镜    CIFilter *filter = [CIFilter filterWithName:@"CIGlassDistortion"                            withInputParameters:params];    [filter setDefaults];        // 输入变形参数    if ([filter respondsToSelector:NSSelectorFromString(@"inputTexture")]) {        CIImage *ciTextureImage = [[CIImage alloc] initWithImage:[UIImage imageNamed:@"grassdistortion.png"]];        [filter setValue:ciTextureImage forKey:@"inputTexture"];    }        // 创建上下文 + 输出图片    CIContext *context   = [CIContext contextWithOptions:nil];    CIImage *outputImage = [filter outputImage];        // 获取图片    CGImageRef cgImage   = [context createCGImage:outputImage                                         fromRect:[outputImage extent]];        // 获取图片    UIImage *image = [UIImage imageWithCGImage:cgImage];        // 释放资源    CGImageRelease(cgImage);        // 加载图片    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];    imageView.frame        = self.view.bounds;    [self.view addSubview:imageView];}@end

需要注意的细节：