UIImageKit is a library of UIImage class.
平时在写一些demo的过程中，想给按钮加一些背景图片，又苦于没有美工去做切图，而只设置按钮背景颜色的话又没有高亮效果，想着不如自己用代码生成一个UIImage来做，于是封装了一些UIImage的扩展类方法，直接调用即可，很方便（效果见最下面demo）。
- 直角矩形
+ (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size
{
CGRect rect = CGRectMake(0, 0, size.width, size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
- 圆角矩形
+ (UIImage *)drawRoundRectImageWithColor:(UIColor *)color size:(CGSize)size
{
CGRect rect = CGRectMake(0, 0, size.width, size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
//去锯齿处理
CGContextSetAllowsAntialiasing(context, true);
CGContextSetShouldAntialias(context, true);
CGContextSetFillColorWithColor(context, [color CGColor]);
//切圆角
float radius = MIN(size.width, size.height);
[[UIBezierPath bezierPathWithRoundedRect:rect
cornerRadius:radius/5] addClip];
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
- 圆形
+ (UIImage *)drawRoundImageWithColor:(UIColor *)color size:(CGSize)size isEmpty:(BOOL)empty
{
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
//去锯齿处理
CGContextSetAllowsAntialiasing(context, true);
CGContextSetShouldAntialias(context, true);
CGContextAddArc(context, size.width/2, size.height/2, size.width/2 - 2, 0, 2*M_PI, YES);
CGContextSetStrokeColorWithColor(context, color.CGColor);//线条颜色
CGContextSetLineWidth(context, 2);//线条宽度
if (empty)
{
CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);//填充颜色
}
else
{
CGContextSetFillColorWithColor(context, color.CGColor);//填充颜色
}
CGContextDrawPath(context, kCGPathFillStroke);//绘制路径加填充
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
- 三角形
+ (UIImage *)drawRadarBottomImageWithColor:(UIColor *)color size:(CGSize)size isEmpty:(BOOL)empty
{
CGRect rect = CGRectMake(0, 0, size.width, size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
//去锯齿处理
CGContextSetAllowsAntialiasing(context, true);
CGContextSetShouldAntialias(context, true);
//画圆点
CGContextAddArc(context, size.width/2, size.width/2, size.width/20, 0, 2*M_PI, YES);
CGContextSetStrokeColorWithColor(context, color.CGColor);//线条颜色
CGContextSetLineWidth(context, 2);//线条宽度
if (empty)
{
CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);//填充颜色
}
else
{
CGContextSetFillColorWithColor(context, color.CGColor);//填充颜色
}
CGContextDrawPath(context, kCGPathFillStroke);
//只要三个点就行跟画一条线方式一样，把三点连接起来
CGPoint sPoints[3];//坐标点
sPoints[0] = CGPointMake(size.width/2, size.height/2 + 6);//坐标1
sPoints[1] = CGPointMake(size.width/2 - 10, size.height-2);//坐标2
sPoints[2] = CGPointMake(size.width/2 + 10, size.height-2);//坐标3
CGContextSetStrokeColorWithColor(context, color.CGColor);//线条颜色
CGContextAddLines(context, sPoints, 3);//添加线
CGContextSetLineWidth(context, 2);//线条宽度
CGContextClosePath(context);//封起来
if (empty)
{
CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);//填充颜色
}
else
{
CGContextSetFillColorWithColor(context, color.CGColor);//填充颜色
}
CGContextDrawPath(context, kCGPathFillStroke); //根据坐标绘制路径
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
- 笑脸
+ (UIImage *)drawSmileFaceImageWithColor:(UIColor *)color size:(CGSize)size radius:(float)radius
{
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
//眼睛
CGContextAddArc(context, size.width/3, size.width/3, size.width/15, 0, 2*M_PI, YES);
CGContextSetStrokeColorWithColor(context, color.CGColor);//线条颜色
CGContextSetLineWidth(context, 2);//线条宽度
CGContextSetFillColorWithColor(context, color.CGColor);//填充颜色
CGContextDrawPath(context, kCGPathFillStroke);//绘制路径加填充
CGContextAddArc(context, size.width*2/3, size.width/3, size.width/15, 0, 2*M_PI, YES);
CGContextSetStrokeColorWithColor(context, color.CGColor);//线条颜色
CGContextSetLineWidth(context, 2);//线条宽度
CGContextSetFillColorWithColor(context, color.CGColor);//填充颜色
CGContextDrawPath(context, kCGPathFillStroke);//绘制路径加填充
//嘴
drawArc(color, CGPointMake(size.width/2, size.height/2), radius, 180/8, 180*7/8, NO);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
/*
画圆弧
CGContextAddArc(context, 圆心x, 圆心y, 半径, 开始弧度, 结束弧度, 1逆时针0顺时针);
角度坐标象限示意图:
PI*3/2
|
|
|
PI ________|_______ 0
|
|
|
PI/2
*/
void drawArc(UIColor *color, CGPoint center, CGFloat radius, CGFloat startAngle, CGFloat endAngle, bool isClockwise)
{
//1.获得图形上下文
CGContextRef context = UIGraphicsGetCurrentContext();
//2.绘制图形
CGContextAddArc(context, center.x, center.y, radius, arc(startAngle), arc(endAngle), isClockwise);
CGContextSetStrokeColorWithColor(context, color.CGColor);//线条颜色
CGContextSetLineWidth(context, 2);//线条宽度
CGContextSetFillColorWithColor(context, [UIColor orangeColor].CGColor);//填充颜色
//3.显示
// CGContextDrawPath(context, kCGPathFillStroke);//绘制路径加填充
//kCGPathFill填充非零绕数规则,kCGPathEOFill表示用奇偶规则,kCGPathStroke路径,kCGPathFillStroke路径填充,kCGPathEOFillStroke表示描线，不是填充
//3.显示
CGContextStrokePath(context);//绘制路径
}
//角度转弧度
CGFloat arc(float angle)
{
return angle*M_PI/180;
}
其中笑脸的眼睛为两个实心圆，嘴使用CGContextAddArc函数画一个圆弧，这一拼凑出一个笑脸（其实主要还是想使用一下画圆弧的这个方法^_^）
- 椭圆
//椭圆
+ (UIImage *)drawEllipseImageWithColor:(UIColor *)color size:(CGSize)size isEmpty:(BOOL)empty
{
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 2);//线条宽度
CGContextSetStrokeColorWithColor(context, color.CGColor);//线条颜色
//去锯齿处理
CGContextSetAllowsAntialiasing(context, true);
CGContextSetShouldAntialias(context, true);
//绘制椭圆
CGContextAddEllipseInRect(context, CGRectMake(2, 2, size.width-4, size.height-4));
if (empty)
{
CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor);//填充颜色
}
else
{
CGContextSetFillColorWithColor(context, color.CGColor);//填充颜色
}
CGContextDrawPath(context, kCGPathFillStroke);//绘制路径加填充
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
- 贝塞尔曲线
//贝塞尔曲线
+ (UIImage *)drawBezierLineImageWithColor:(UIColor *)color size:(CGSize)size isEmpty:(BOOL)empty
{
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 2);//线条宽度
CGContextSetStrokeColorWithColor(context, color.CGColor);//线条颜色
//绘制贝塞尔
CGPoint fromPoint = CGPointMake(0, size.height/2); //起点
CGPoint toPoint = CGPointMake(size.width, size.height/2); //终点
CGPoint controlPoint1 = CGPointMake(size.width/3, 0); //控制点1
CGPoint controlPoint2 = CGPointMake(size.width*2/3, size.height); //控制点2
CGContextMoveToPoint(context, fromPoint.x, fromPoint.y);
CGContextAddCurveToPoint(context, controlPoint1.x, controlPoint1.y, controlPoint2.x, controlPoint2.y, toPoint.x, toPoint.y);
if (empty)
{
CGContextStrokePath(context);//填充颜色
}
else
{
CGContextSetFillColorWithColor(context, [UIColor redColor].CGColor);//填充颜色
CGContextDrawPath(context, kCGPathFillStroke);//绘制路径加填充
}
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
不定期更新补充...
Demo下载链接：CategoryDemo
pod search UIImageKit
-> UIImageKit (1.0.0)
UIImageKit is a library of UIImage class.
pod 'UIImageKit', '~> 1.0.0'
- Homepage: https://github.com/Kangqj/UIImageKit
- Source: https://github.com/Kangqj/UIImageKit.git
- Versions: 1.0.0 [master repo]
(END)
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