1.CoreImage 中的模糊滤镜
1.1CoreImage是苹果用来简化图片处理的框架
1.2CIImage、CIFilter与CIContext三者联系
1.3CIGaussianBlur中可能设置的参数
2.UIImage+imageEffects的category模糊效果
3.iOS8中的UIVisualEffectView模糊效果的用法
一、.CoreImage 中的模糊滤镜
- (void)coreImageBlur
{
//原始图片
UIImage *image = [UIImage imageNamed:@"CoreImage"];
//CoreImage部分--------------------
//CIImage
CIImage *ciImage = [[CIImage alloc]initWithImage:image];
//CIFilter
CIFilter*blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
//将图片输入到滤镜中
[blurFilter setValue:ciImage forKey:kCIInputImageKey];
//设置模糊程序
[blurFilter setValue:@(1) forKey:@"inputRadius"];
//用业查询滤镜可以设置的参数以及一引起相关的信息
NSLog(@"%@",[blurFilter attributes]);
//将处理好的图片输出
CIImage *outCiImage = [blurFilter valueForKey:kCIOutputImageKey];
//CIContext
CIContext *context = [CIContext contextWithOptions:nil];
//获取CGImage句柄
CGImageRef outCGImage = [context createCGImage:outCiImage
fromRect:[outCiImage extent]];
//最终获取到图片
UIImage *blurImage = [UIImage imageWithCGImage:outCGImage];
//释放CGImage句柄
CGImageRelease(outCGImage);
//---------------------------------
//
//初始化UIImageView
UIImageView *imageView = \
[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 590/2.0, 988/2.0)];
imageView.image = blurImage;
imageView.center = self.view.center;
[self.view addSubview:imageView];
}
二、UIImage+ImageEffects的category 模糊效果
#import "UIImage+ImageEffects.h"
- (void)effectiveImages
{
UIImage *sourceImage = [UIImage imageNamed:@"normal"];
CGSize imageSize = sourceImage.size;
UIImage *blurImage = [sourceImage blurImageAtFrame:CGRectMake(0, 0, imageSize.width/2, imageSize.height )];
UIImageView *imageView = [[UIImageView alloc]initWithImage:blurImage];
imageView.center = self.view.center;
[self.view addSubview:imageView];
}
- (void)visualEffectImage
{
UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:self.view.bounds];
UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImageimageNamed:@"normal"]];
scrollView.contentSize = imageView.image.size;
scrollView.bounces = NO;
[scrollView addSubview:imageView];
[self.view addSubview:scrollView];
/*添加模糊效果*/
//1.创建模糊View
UIVisualEffectView *effectView = [[UIVisualEffectView alloc]initWithEffect:[UIBlurEffecteffectWithStyle:UIBlurEffectStyleLight ]];
//2.设定尺寸
effectView.frame = CGRectMake(0, 100, 320, 200);
//3.添加到View当中
[self.view addSubview:effectView];
//4.添加显示文本
UILabel *label = [[UILabel alloc]initWithFrame:effectView.bounds];
label.text = @"hello world";
label.font = [UIFont systemFontOfSize:32];
label.textAlignment = NSTextAlignmentCenter;
// [effectView.contentView addSubview:label];
//5.
//添加模糊子View的UIVisualEffectView
//1.创建出子模糊View
UIVisualEffectView *subEffectView = [[UIVisualEffectView alloc]initWithEffect:[UIVibrancyEffect effectForBlurEffect:(UIBlurEffect *)effectView.effect]];
//2.设定尺寸
subEffectView.frame = effectView.bounds;
//3.将子模糊View添加到effective的contentView才能生效
[effectView.contentView addSubview:subEffectView];
//4.添加要显示的View来达到特殊的效果
[subEffectView.contentView addSubview:label];
}
@interface BlurDownloadPicView : UIView
@property (nonatomic,strong)NSString *pictureUrlString;//图片下载地址
@property (nonatomic) UIViewContentMode contentMode;//图片显示方式
//开始执行
- (void)startProgress;
@end
#import "UIImage+ImageEffects.h"
#import "BlurDownloadPicView.h"
#import "GCD.h"
@interface BlurDownloadPicView()
@property (nonatomic,strong)UIImageView *imageView;
@end
@implementation BlurDownloadPicView
- (instancetype)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
//初始化控件
//最好放一个方法中
self.imageView = [[UIImageView alloc]initWithFrame:self.bounds];
self.imageView.alpha = 0.f;
[self addSubview:self.imageView];
}
return self;
}
- (void)startProgress{
if (self.pictureUrlString) {
[GCDQueue executeInGlobalQueue:^{
//创建请求
NSURLRequest *request = [NSURLRequest requestWithURL:
[NSURL URLWithString:self.pictureUrlString]];
//因为是同步请求，会阻塞主线程
NSData *data = [NSURLConnection sendSynchronousRequest:request
returningResponse:nil
error:nil];
UIImage *image = [[UIImage alloc]initWithData:data];
//对图片进行模糊，会阻塞主线程
UIImage *blurImage = [image blurImage];
[GCDQueue executeInMainQueue:^{
[UIView animateWithDuration:1.0 animations:^{
self.imageView.alpha = 1.f;
}];
self.imageView.image = blurImage;
}];
}];
}
}
@synthesize contentMode = _contentMode;
- (void)setContentMode:(UIViewContentMode)contentMode{
_contentMode = contentMode;
self.imageView.contentMode = contentMode;
}
- (UIViewContentMode)contentMode{
return _contentMode;
}
@end
- (void)viewDidLoad {
[super viewDidLoad];
//[self coreImageBlur];
//[self visualEffectImage];
NSString *picUrlString = @"http://t1.mmonly.cc/uploads/allimg/tuku2/14400BR6-0.jpg";
BlurDownloadPicView *blurDownLoadView = [[BlurDownloadPicView alloc]initWithFrame:self.view.bounds];
blurDownLoadView.center = self.view.center;
[self.view addSubview:blurDownLoadView];
blurDownLoadView.pictureUrlString = picUrlString;
blurDownLoadView.contentMode = UIViewContentModeScaleAspectFill;
[blurDownLoadView startProgress];
}
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原文地址：http://blog.csdn.net/baitxaps/article/details/46854969
