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[英]How do I use XCTest to test if a navigationBar is not set to a specific colour in objective-C?
[英]How to do colour shading in Objective-C
CAGradientLayer将服务于您的目的 - 参考:
http://blog.apoorvmote.com/gradient-background-uiview-ios-swift/
您可以使用渐变图像或CAGradientLayer来实现此目的
CAGradientLayer
添加到现有按钮:
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = button.bounds;
gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor whiteColor] CGColor], (id)[[UIColor blackColor] CGColor], nil];
[button.layer insertSublayer:gradient atIndex:0];
您可以使用图像显示阴影。 使用模糊图像或更改图像视图的alpha。
或者如果您想以编程方式执行此操作,请尝试:
对象:
//create elliptical shadow for button through UIBezierPath
CGRect ovalRect = button.bounds;
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:ovalRect];
//applying shadow to path
button.layer.shadowColor = [UIColor yourcolor].CGColor;
button.layer.shadowOffset = CGSizeMake(0.0, 0.0);
button.layer.shadowOpacity = 1.0;
button.layer.shadowRadius = 3.0;
button.layer.shadowPath = path.CGPath;
斯威夫特:
//create elliptical shdow forimage through UIBezierPath
var ovalRect = button.bounds
var path = UIBezierPath(ovalInRect: ovalRect)
//applying shadow to path
button.layer.shadowColor = UIColor(white: 0.0, alpha: 0.5).CGColor
button.layer.shadowOffset = CGSizeMake(0.0, 0.0)
button.layer.shadowOpacity = 1.0
button.layer.shadowRadius = 3.0
button.layer.shadowPath = path.CGPath
取自http://www.innofied.com/implementing-shadow-ios/,并且还要了解更多: UIView有圆角和阴影?
我的另一个答案与此相关: 在ios中投下阴影
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