66 lines
2.2 KiB
Mathematica
66 lines
2.2 KiB
Mathematica
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// UIImage+Gradient.m
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// testLayer
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//
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// Created by tb on 17/3/17.
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// Copyright © 2017年 com.tb. All rights reserved.
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//
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#import "UIImage+Gradient.h"
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@implementation UIImage (Gradient)
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- (UIImage *)createImageWithSize:(CGSize)imageSize gradientColors:(NSArray *)colors percentage:(NSArray *)percents gradientType:(GradientType)gradientType {
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NSAssert(percents.count <= 5, @"输入颜色数量过多，如果需求数量过大，请修改locations[]数组的个数");
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NSMutableArray *ar = [NSMutableArray array];
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for(UIColor *c in colors) {
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[ar addObject:(id)c.CGColor];
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}
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CGFloat locations[5];
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for (int i = 0; i < percents.count; i++) {
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locations[i] = [percents[i] floatValue];
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}
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UIGraphicsBeginImageContextWithOptions(imageSize, YES, 1);
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CGContextRef context = UIGraphicsGetCurrentContext();
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CGContextSaveGState(context);
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CGColorSpaceRef colorSpace = CGColorGetColorSpace([[colors lastObject] CGColor]);
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CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (CFArrayRef)ar, locations);
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CGPoint start;
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CGPoint end;
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switch (gradientType) {
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case GradientFromTopToBottom:
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start = CGPointMake(imageSize.width/2, 0.0);
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end = CGPointMake(imageSize.width/2, imageSize.height);
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break;
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case GradientFromLeftToRight:
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start = CGPointMake(0.0, imageSize.height/2);
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end = CGPointMake(imageSize.width, imageSize.height/2);
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break;
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case GradientFromLeftTopToRightBottom:
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start = CGPointMake(0.0, 0.0);
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end = CGPointMake(imageSize.width, imageSize.height);
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break;
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case GradientFromLeftBottomToRightTop:
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start = CGPointMake(0.0, imageSize.height);
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end = CGPointMake(imageSize.width, 0.0);
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break;
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default:
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break;
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}
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CGContextDrawLinearGradient(context, gradient, start, end, kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
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UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
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CGGradientRelease(gradient);
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CGContextRestoreGState(context);
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UIGraphicsEndImageContext();
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return image;
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}
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@end
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