斯威夫特3

在视图上添加一个渐变层

Bind your view outlet @IBOutlet var YOURVIEW : UIView! Define the CAGradientLayer() var gradient = CAGradientLayer() Here is the code you have to write in your viewDidLoad YOURVIEW.layoutIfNeeded() gradient.startPoint = CGPoint(x: CGFloat(0), y: CGFloat(1)) gradient.endPoint = CGPoint(x: CGFloat(1), y: CGFloat(0)) gradient.frame = YOURVIEW.bounds gradient.colors = [UIColor.red.cgColor, UIColor.green.cgColor] gradient.colors = [ UIColor(red: 255.0/255.0, green: 56.0/255.0, blue: 224.0/255.0, alpha: 1.0).cgColor,UIColor(red: 86.0/255.0, green: 13.0/255.0, blue: 232.0/255.0, alpha: 1.0).cgColor,UIColor(red: 16.0/255.0, green: 173.0/255.0, blue: 245.0/255.0, alpha: 1.0).cgColor] gradient.locations = [0.0 ,0.6 ,1.0] YOURVIEW.layer.insertSublayer(gradient, at: 0)

你可以创建一个自定义类GradientView:

斯威夫特5

class GradientView: UIView {
    override open class var layerClass: AnyClass {
       return CAGradientLayer.classForCoder()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        let gradientLayer = layer as! CAGradientLayer
        gradientLayer.colors = [UIColor.white.cgColor, UIColor.black.cgColor]
    }
}

在故事板中，将类类型设置为你想要有渐变背景的任何视图:

这在以下方面是更好的:

不需要设置框架的克莱尔 像往常一样在UIView上使用NSConstraint 不需要创建子层(更少的内存使用)

试试这个对我来说很有魔力，

Objective - C

我已经设置了RGB渐变背景颜色为UIview

   UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0,0,320,35)];
   CAGradientLayer *gradient = [CAGradientLayer layer];
   gradient.frame = view.bounds;
   gradient.startPoint = CGPointZero;
   gradient.endPoint = CGPointMake(1, 1);
   gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor colorWithRed:34.0/255.0 green:211/255.0 blue:198/255.0 alpha:1.0] CGColor],(id)[[UIColor colorWithRed:145/255.0 green:72.0/255.0 blue:203/255.0 alpha:1.0] CGColor], nil];
   [view.layer addSublayer:gradient];

更新: Swift3 +

代码:

 var gradientView = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 35))
 let gradientLayer:CAGradientLayer = CAGradientLayer()
 gradientLayer.frame.size = self.gradientView.frame.size
 gradientLayer.colors = 
 [UIColor.white.cgColor,UIColor.red.withAlphaComponent(1).cgColor] 
//Use diffrent colors
 gradientView.layer.addSublayer(gradientLayer)

你可以添加渐变颜色的起点和终点。

  gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.0)
  gradientLayer.endPoint = CGPoint(x: 1.0, y: 1.0)

更多细节请参考CAGradientLayer文档

希望这对一些人有所帮助。

extension UIView {

    func applyGradient(isVertical: Bool, colorArray: [UIColor]) { 
        layer.sublayers?.filter({ $0 is CAGradientLayer }).forEach({ $0.removeFromSuperlayer() })
         
        let gradientLayer = CAGradientLayer()
        gradientLayer.colors = colorArray.map({ $0.cgColor })
        if isVertical {
            //top to bottom
            gradientLayer.locations = [0.0, 1.0]
        } else {
            //left to right
            gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)
            gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5)
        }
        
        backgroundColor = .clear
        gradientLayer.frame = bounds
        layer.insertSublayer(gradientLayer, at: 0)
    }

}

使用

someView.applyGradient(isVertical: true, colorArray: [.green, .blue])

因为我只需要一种类型的梯度在我的应用程序，我创建了一个子类的UIView和预配置梯度层初始化固定的颜色。 UIView的初始化器调用configuregradientlayer -方法，它配置CAGradientLayer:

DDGradientView.h:

#import <UIKit/UIKit.h>

@interface DDGradientView : UIView {

}
@end

DDGradientView.m:

#import "DDGradientView.h"

@implementation DDGradientView

// Change the views layer class to CAGradientLayer class
+ (Class)layerClass
{
    return [CAGradientLayer class];
}

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if(self) {
        [self configureGradientLayer];
    }
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if(self) {
        [self configureGradientLayer];
    }
    return self;
}

// Make custom configuration of your gradient here   
- (void)configureGradientLayer {
    CAGradientLayer *gLayer = (CAGradientLayer *)self.layer;
    gLayer.colors = [NSArray arrayWithObjects:(id)[[UIColor whiteColor] CGColor], (id)[[UIColor lightGrayColor] CGColor], nil];
}
@end

这个框架适用于Historyboard中的渐变和其他UI修改:在Interface Builder中使用IBAnimatable为App Store就绪的应用程序设计和原型定制UI、交互、导航、过渡和动画。

有了这个，你可以选择一个视图，将类设置为AnimatableView，并从Interface Builder属性设置梯度和实时预览结果。

看这个知道如何应用渐变到UIView。