将cifilter应用于calayer
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13-12-2019 - |
题
ci滤镜现在在iOS 5中提供,我正在尝试将一个加到一个calayer,“的方式D在Mac 上进行。这是我的代码:
CALayer *myCircle = [CALayer layer];
myCircle.bounds = CGRectMake(0,0,30,30);
myCircle.position = CGPointMake(100,100);
myCircle.cornerRadius = 15;
myCircle.borderColor = [UIColor whiteColor].CGColor;
myCircle.borderWidth = 2;
myCircle.backgroundColor = [UIColor whiteColor].CGColor;
CIFilter *blurFilter = [CIFilter filterWithName:@"CIDiscBlur"];
[blurFilter setDefaults];
[blurFilter setValue:[NSNumber numberWithFloat:5.0f] forKey:@"inputRadius"];
[myCircle setFilters:[NSArray arrayWithObjects:blurFilter, nil]];
[self.view.layer addSublayer:myCircle];
.
我的白色圆圈抽出罚款,但过滤器未应用。
解决方案
除此之外,除了生成的世代odicetagcode(如iOS SDK 5.1),并且该世生逻辑划分器似乎不可用,您可以执行以下操作:
从图层的内容创建输入cimage:
CIImage *inputImage = [CIImage imageWithCGImage:(CGImageRef)(myCircle.contents)];`
.
应用您的过滤器并在Cgimageref中获取结果:
CIFilter *filter = [CIFilter filterWith...];// A filter that is available in iOS or a custom one :)
...
CIImage *outputImage = [filter outputImage];
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]];
.
最后将cgimageref设置为图层:
[myCircle setContents:(id)cgimg];
.
这应该有效:)
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