简单创建CIFilter 没有专业处理， 仅能达到简单的模糊效果，效果如图
（1）原图
（2）旧色调处理效果
（3）模糊处理
简单的代码结果如下
//
// ViewController.m
// 滤镜
// 本文查看地址
// Created by yangxiuying on 15/1/21.
// Copyright (c) 2015年 lanjiying. All rights reserved.
//
#import "ViewController.h"
typedef enum
{
///旧色调
SepiaTone =
0,
///模糊设置
GaussianBlur,
}Stype;
@interface
ViewController ()
@property(nonatomic,retain)UISlider * slider;
@property(nonatomic,retain)UISegmentedControl * segmentControl;
@property(nonatomic,assign)Stype type;
@property(nonatomic,retain)UIImageView * imgView;
@property(nonatomic,retain)UIImage * image;
@property(nonatomic,retain)UIImageView * imageView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super
viewDidLoad];
UILabel * label = [[UILabel
alloc] initWithFrame:CGRectMake(20,
30, 280,
20)];
label.backgroundColor = [UIColor
cyanColor];
label.text =
@"先选中按钮，再拖动滑块即可达到想要的效果";
label.numberOfLines =
0;
label.font = [UIFont
systemFontOfSize:14.0];
[self.view
addSubview:label];
_slider = [[UISlider
alloc] initWithFrame:CGRectMake(50,
50,
200, 40)];
_slider.maximumValue =
1.0;
_slider.minimumValue =
0;
_slider.continuous =
YES;
[_slider
addTarget:self
action:@selector(valueChange)
forControlEvents:UIControlEventValueChanged];
[self.view
addSubview:_slider];
_segmentControl = [[UISegmentedControl
alloc] initWithFrame:CGRectMake(100,
80,
120, 40)];
// _segmentControl.segmentedControlStyle = UISegmentedControlStyleBar;
[_segmentControl
insertSegmentWithTitle:@"旧色调"
atIndex:0
animated:YES];
[_segmentControl
insertSegmentWithTitle:@"模糊设置"
atIndex:1
animated:YES];
[_segmentControl
addTarget:self
action:@selector(ButtonAction)
forControlEvents:UIControlEventValueChanged];
[self.view
addSubview:_segmentControl];
_image = [UIImage
imageNamed:@"朝霞.jpg"];
_imageView = [[UIImageView
alloc]
initWithFrame:CGRectMake(50,
150,
_image.size.width,
_image.size.height)];
[_imageView
setImage:_image];
[self.view
addSubview:_imageView];
}
-(void)ButtonAction
{
switch (_segmentControl.selectedSegmentIndex) {
case 0:
{
self.type =
SepiaTone;//旧色调
}
break;
default:
{
self.type =
GaussianBlur; //模糊设置
}
break;
}
}
-(void)valueChange
{
switch (self.type) {
case SepiaTone:
{
//旧色调
[self
filterSepiaTone];
}
break;
default:
{
//模糊设置
[self
filterGaussianBlur];
}
break;
}
}
//旧色调处理
-(void)filterSepiaTone
{
//创建CIContext对象(默认值，传入nil)
CIContext * context = [CIContext
contextWithOptions:nil];
//获取图片
CIImage * cimage = [CIImage
imageWithCGImage:[_image
CGImage]];
//创建CIFilter
CIFilter * sepiaTone = [CIFilter
filterWithName:@"CISepiaTone"];
//设置滤镜输入参数
[sepiaTone
setValue:cimage forKey:@"inputImage"];
//获取滑块的Value，设置色调强度
[sepiaTone setValue:[NSNumber
numberWithFloat:[_slider
value]] forKey:@"inputIntensity"];
//创建处理后的图片
CIImage * resultImage = [sepiaTone
valueForKey:@"outputImage"];
CGImageRef imageRef = [context
createCGImage:resultImage fromRect:CGRectMake(0,
0, self.image.size.width,
self.image.size.height)];
UIImage * image = [[UIImage
alloc] initWithCGImage:imageRef];
[_imageView
setImage:image];
CFRelease(imageRef);
}
//模糊设置处理
-(void)filterGaussianBlur
{
//创建CIContext对象
CIContext * context = [CIContext
contextWithOptions:nil];
//获取图片
CIImage * image = [CIImage
imageWithCGImage:[_image
CGImage]];
//创建CIFilter
CIFilter * gaussianBlur = [CIFilter
filterWithName:@"CIGaussianBlur"];
//设置滤镜输入参数
[gaussianBlur
setValue:image forKey:@"inputImage"];
//设置模糊参数
[gaussianBlur
setValue:[NSNumber
numberWithFloat:_slider.value*10]
forKey:@"inputRadius"];
//得到处理后的图片
CIImage* resultImage = [gaussianBlur
valueForKey:@"outputImage"];
CGImageRef imageRef = [context
createCGImage:resultImage fromRect:CGRectMake(0,
0, self.image.size.width,
self.image.size.height)];
UIImage * imge = [[UIImage
alloc] initWithCGImage:imageRef];
[_imageView
setImage:imge];
CFRelease(imageRef);
}
@end