iOS 之漸層顏色

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效果如下：

實現代碼如下：

.H

#import <UIKit/UIKit.h>/** 漸層方式 - IHGradientChangeDirectionLevel:              水平漸層 - IHGradientChangeDirectionVertical:           豎直漸層 - IHGradientChangeDirectionUpwardDiagonalLine: 向下對角線漸層 - IHGradientChangeDirectionDownDiagonalLine:   向上對角線漸層 */typedef NS_ENUM(NSInteger, IHGradientChangeDirection) {    IHGradientChangeDirectionLevel,    IHGradientChangeDirectionVertical,    IHGradientChangeDirectionUpwardDiagonalLine,    IHGradientChangeDirectionDownDiagonalLine,};@interface UIColor (IHGradientChange)/** 建立漸層顏色 @param size       漸層的size @param direction  漸層方式 @param startcolor 開始顏色 @param endColor   結束顏色 @return 建立的漸層顏色 */+ (instancetype)bm_colorGradientChangeWithSize:(CGSize)size                                     direction:(IHGradientChangeDirection)direction                                    startColor:(UIColor *)startcolor                                      endColor:(UIColor *)endColor;// 其他曲線漸層暫不考慮@end

.M：

#import "UIColor+IHGradientChange.h"@implementation UIColor (IHGradientChange)+ (instancetype)bm_colorGradientChangeWithSize:(CGSize)size                                     direction:(IHGradientChangeDirection)direction                                    startColor:(UIColor *)startcolor                                      endColor:(UIColor *)endColor {        if (CGSizeEqualToSize(size, CGSizeZero) || !startcolor || !endColor) {        return nil;    }        CAGradientLayer *gradientLayer = [CAGradientLayer layer];    gradientLayer.frame = CGRectMake(0, 0, size.width, size.height);    CGPoint startPoint = CGPointZero;    if (direction == IHGradientChangeDirectionDownDiagonalLine) {        startPoint = CGPointMake(0.0, 1.0);    }    gradientLayer.startPoint = startPoint;        CGPoint endPoint = CGPointZero;    switch (direction) {        case IHGradientChangeDirectionLevel:            endPoint = CGPointMake(1.0, 0.0);            break;        case IHGradientChangeDirectionVertical:            endPoint = CGPointMake(0.0, 1.0);            break;        case IHGradientChangeDirectionUpwardDiagonalLine:            endPoint = CGPointMake(1.0, 1.0);            break;        case IHGradientChangeDirectionDownDiagonalLine:            endPoint = CGPointMake(1.0, 0.0);            break;        default:            break;    }    gradientLayer.endPoint = endPoint;        gradientLayer.colors = @[(__bridge id)startcolor.CGColor, (__bridge id)endColor.CGColor];    UIGraphicsBeginImageContext(size);    [gradientLayer renderInContext:UIGraphicsGetCurrentContext()];    UIImage*image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return [UIColor colorWithPatternImage:image];}@end

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iOS 之漸層顏色