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[英]Swift 3: How to create blurred side edges/corners of a UIImageView?
[英]How do I fade the corners/edges/borders of a UIImageView
我无法在论坛上找到这个,所以我决定发布这个。
我有一个UIImageView与以下代码相互淡化图像。
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound)];
imageNames = [NSArray arrayWithObjects:@"image1.jpg", @"image2.jpg", @"image3.jpg", @"image4.jpg", @"image5.jpg", nil];
imageview.image = [UIImage imageNamed:[imageNames objectAtIndex:0]];
[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(transitionPhotos) userInfo:nil repeats:YES];
// Rounds corners of imageview
CALayer *layer = [imageview layer];
[layer setMasksToBounds:YES];
[layer setCornerRadius:5];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)transitionPhotos{
if (photoCount < [imageNames count] - 1){
photoCount ++;
}else{
photoCount = 0;
}
[UIView transitionWithView:imageview
duration:2.0
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{imageview.image = [UIImage imageNamed:[imageNames objectAtIndex:photoCount]]; }
completion:NULL];
}
我想实现一个淡化我的imageview边框的代码。
我知道我可以使用QuartzCore.framework,但是我无法找到如何实现我想要的结果的指南。
什么是最短的代码来做这样的方法?
有一个包含蒙版的图像(透明背景上的模糊矩形):
UIImage *mask = [UIImage imageNamed:@"mask.png"];
创建一个maskLayer:
CALayer *maskLayer = [CALayer layer];
maskLayer.contents = (id)mask.CGImage;
maskLayer.frame = imageView.bounds;
并将其指定为imageView的掩码:
imageView.layer.mask = maskLayer;
编辑:您可以使用CALayer
的阴影属性通过代码完全创建蒙版。 只需使用shadowRadius
和shadowPath
:
CALayer *maskLayer = [CALayer layer];
maskLayer.frame = imageView.bounds;
maskLayer.shadowRadius = 5;
maskLayer.shadowPath = CGPathCreateWithRoundedRect(CGRectInset(imageView.bounds, 5, 5), 10, 10, nil);
maskLayer.shadowOpacity = 1;
maskLayer.shadowOffset = CGSizeZero;
maskLayer.shadowColor = [UIColor whiteColor].CGColor;
imageView.layer.mask = maskLayer;
对于圆角,您需要修改以下代码: -
imageView.layer.cornerRadius = 5;
imageView.layer.clipsToBounds = YES;
这是代码:
UIImage sourceImage = ...
GPUImagePicture *imageSource = [[GPUImagePicture alloc] initWithImage:sourceImage];
GPUImageTransformFilter *transformFilter = [GPUImageTransformFilter new];
GPUImageFastBlurFilter *blurFilter = [GPUImageFastBlurFilter new];
//Force processing at scale factor 1.4 and affine scale with scale factor 1 / 1.4 = 0.7
[transformFilter forceProcessingAtSize:CGSizeMake(SOURCE_WIDTH * 1.4, SOURCE_WIDTH * 1.4)];
[transformFilter setAffineTransform:CGAffineTransformMakeScale(0.7, 0.7)];
//Setup desired blur filter
[blurFilter setBlurSize:3.0f];
[blurFilter setBlurPasses:20];
//Chain Image->Transform->Blur->Output
[imageSource addTarget:transformFilter];
[transformFilter addTarget:blurFilter];
[imageSource processImage];
UIImage *blurredImage = [blurFilter imageFromCurrentlyProcessedOutputWithOrientation:UIImageOrientationUp];
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