iOS-UIImage图片绘制颜色、UIColor渐变色
图片绘制颜色
- (UIImage *)dtk_setImageColor:(UIColor *)imageColor{ //获取画布 UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f); //画笔沾取颜色 [imageColor setFill]; CGRect bounds = CGRectMake(0, 0, self.size.width, self.size.height); //绘制一次 UIRectFill(bounds); //再绘制一次 [self drawInRect:bounds blendMode:kCGBlendModeOverlay alpha:1.0f]; //获取图片 [self drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:1.0f]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image; }
渐变色
.h
/** 渐变方式 - GradientChangeDirectionLevel: 水平渐变 - GradientChangeDirectionVertical: 竖直渐变 - GradientChangeDirectionUpwardDiagonalLine: 向下对角线渐变 - GradientChangeDirectionDownDiagonalLine: 向上对角线渐变 */ typedef NS_ENUM(NSInteger, DUEGradientChangeDirection) { DUEGradientChangeDirectionLevel, DUEGradientChangeDirectionVertical, DUEGradientChangeDirectionUpwardDiagonalLine, DUEGradientChangeDirectionDownDiagonalLine, }; /** 创建渐变颜色 @param size 渐变的size @param direction 渐变方式 @param startcolor 开始颜色 @param endColor 结束颜色 @return 创建的渐变颜色 */ + (instancetype)due_colorGradientChangeWithSize:(CGSize)size direction:(DUEGradientChangeDirection)direction startColor:(UIColor *)startcolor endColor:(UIColor *)endColor;
.m
+ (instancetype)due_colorGradientChangeWithSize:(CGSize)size direction:(DUEGradientChangeDirection)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 == DUEGradientChangeDirectionDownDiagonalLine) { startPoint = CGPointMake(0.0, 1.0); } gradientLayer.startPoint = startPoint; CGPoint endPoint = CGPointZero; switch (direction) { case DUEGradientChangeDirectionLevel: endPoint = CGPointMake(1.0, 0.0); break; case DUEGradientChangeDirectionVertical: endPoint = CGPointMake(0.0, 1.0); break; case DUEGradientChangeDirectionUpwardDiagonalLine: endPoint = CGPointMake(1.0, 1.0); break; case DUEGradientChangeDirectionDownDiagonalLine: 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]; }