问题描述
我有一个UIImageView,我想在后面添加一个阴影。我希望苹果将其作为一种财产,但他们必须为我们的程序员做很多事情,所以我需要问这个问题。
I have a UIImageView that I want to add a shadow behind. I wish that apple had that as a property but they have to make lots of things hard for us programmers so I need to ask this question.
推荐答案
有一种更好,更简单的方法。 UIImageView继承自UIView,因此它具有图层属性。你可以访问图层的阴影属性和bam,你有一个阴影。
There's a better and easier way to do this. UIImageView inherits from UIView so it has a layer property. You can access the layer's shadow properties and bam, you got a shadow.
如果你把UIImageView作为nib文件的IBOutlet,你可以实现awakeFromNib
例如
If you have the UIImageView as an IBOutlet to a nib file, you can just implement the awakeFromNibe.g.
Objective-C
- (void)awakeFromNib {
imageView.layer.shadowColor = [UIColor purpleColor].CGColor;
imageView.layer.shadowOffset = CGSizeMake(0, 1);
imageView.layer.shadowOpacity = 1;
imageView.layer.shadowRadius = 1.0;
imageView.clipsToBounds = NO;
}
不要忘记 #importQuartzCore / CALayer.h
对于Swift,你可以采取多种方式。创建类扩展,子类或imageView实例。无论哪种方式,修改图层阴影属性的过程都相同。
For Swift, you can go about it multiple ways. Create a class extension, subclass, or an imageView instance. Whichever the way, the process is the same in modifying the layers shadow property.
Swift 3
override func awakeFromNib() {
super.awakeFromNib()
imageView.layer.shadowColor = UIColor.purple.cgColor
imageView.layer.shadowOffset = CGSize(width: 0, height: 1)
imageView.layer.shadowOpacity = 1
imageView.layer.shadowRadius = 1.0
imageView.clipsToBounds = false
}
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