// Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext();/*NO.1畫一條線CGContextSetRGBStrokeColor(context, 0.5, 0.5, 0.5, 0.5);//線條顏色 CGContextMoveToPoint(context, 20, 20); CGContextAddLineToPoint(context, 200,20); CGContextStrokePath(context); *//*NO.2寫文字CGContextSetLineWidth(context, 1.0); CGContextSetRGBFillColor (context, 0.5, 0.5, 0.5, 0.5); UIFont *font = [UIFont boldSystemFontOfSize:18.0]; [@"公司：北京中軟科技股份有限公司\n部門：ERP事業部\n姓名：McLiang" drawInRect:CGRectMake(20, 40, 280, 300) withFont:font]; *//*NO.3畫一個正方形圖形 沒有邊框CGContextSetRGBFillColor(context, 0, 0.25, 0, 0.5); CGContextFillRect(context, CGRectMake(2, 2, 270, 270)); CGContextStrokePath(context); *//*NO.4畫正方形邊框CGContextSetRGBStrokeColor(context, 0.5, 0.5, 0.5, 0.5);//線條顏色 CGContextSetLineWidth(context, 2.0); CGContextAddRect(context, CGRectMake(2, 2, 270, 270)); CGContextStrokePath(context); *//*NO.5畫方形背景顏色CGContextTranslateCTM(context, 0.0f, self.bounds.size.height); CGContextScaleCTM(context, 1.0f, -1.0f); UIGraphicsPushContext(context); CGContextSetLineWidth(context,320); CGContextSetRGBStrokeColor(context, 250.0/255, 250.0/255, 210.0/255, 1.0); CGContextStrokeRect(context, CGRectMake(0, 0, 320, 460)); UIGraphicsPopContext(); *//*NO.6橢圓CGRect aRect= CGRectMake(80, 80, 160, 100); CGContextSetRGBStrokeColor(context, 0.6, 0.9, 0, 1.0); CGContextSetLineWidth(context, 3.0); CGContextAddEllipseInRect(context, aRect); //橢圓 CGContextDrawPath(context, kCGPathStroke); *//*NO.7 CGContextBeginPath(context); CGContextSetRGBStrokeColor(context, 0, 0, 1, 1); CGContextMoveToPoint(context, 100, 100); CGContextAddArcToPoint(context, 50, 100, 50, 150, 50); CGContextStrokePath(context); *//*NO.8漸變 CGContextClip(context); CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB(); CGFloat colors[] = { 204.0 / 255.0, 224.0 / 255.0, 244.0 / 255.0, 1.00, 29.0 / 255.0, 156.0 / 255.0, 215.0 / 255.0, 1.00, 0.0 / 255.0, 50.0 / 255.0, 126.0 / 255.0, 1.00, }; CGGradientRef gradient = CGGradientCreateWithColorComponents (rgb, colors, NULL, sizeof(colors)/(sizeof(colors[0])*4)); CGColorSpaceRelease(rgb); CGContextDrawLinearGradient(context, gradient,CGPointMake (0.0,0.0) ,CGPointMake(0.0,self.frame.size.height), kCGGradientDrawsBeforeStartLocation); *//* NO.9四條線畫一個正方形 //畫線 UIColor *aColor = [UIColor colorWithRed:0 green:1.0 blue:0 alpha:0]; CGContextSetRGBStrokeColor(context, 1.0, 0, 0, 1.0); CGContextSetFillColorWithColor(context, aColor.CGColor); CGContextSetLineWidth(context, 4.0); CGPoint aPoints[5]; aPoints[0] =CGPointMake(60, 60); aPoints[1] =CGPointMake(260, 60); aPoints[2] =CGPointMake(260, 300); aPoints[3] =CGPointMake(60, 300); aPoints[4] =CGPointMake(60, 60); CGContextAddLines(context, aPoints, 5); CGContextDrawPath(context, kCGPathStroke); //開始畫線 *//* NO.10 UIColor *aColor = [UIColor colorWithRed:0 green:1.0 blue:0 alpha:0]; CGContextSetRGBStrokeColor(context, 1.0, 0, 0, 1.0); CGContextSetFillColorWithColor(context, aColor.CGColor); //橢圓 CGRect aRect= CGRectMake(80, 80, 160, 100); CGContextSetRGBStrokeColor(context, 0.6, 0.9, 0, 1.0); CGContextSetLineWidth(context, 3.0); CGContextSetFillColorWithColor(context, aColor.CGColor); CGContextAddRect(context, rect); //矩形 CGContextAddEllipseInRect(context, aRect); //橢圓 CGContextDrawPath(context, kCGPathStroke); *//* NO.11 畫一個實心的圓CGContextFillEllipseInRect(context, CGRectMake(95, 95, 100.0, 100)); *//*NO.12 畫一個菱形 CGContextSetLineWidth(context, 2.0); CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor); CGContextMoveToPoint(context, 100, 100); CGContextAddLineToPoint(context, 150, 150); CGContextAddLineToPoint(context, 100, 200); CGContextAddLineToPoint(context, 50, 150); CGContextAddLineToPoint(context, 100, 100); CGContextStrokePath(context); *//*NO.13 畫矩形 CGContextSetLineWidth(context, 2.0);CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);CGRect rectangle = CGRectMake(60,170,200,80);CGContextAddRect(context, rectangle);CGContextStrokePath(context); *//*橢圓 CGContextSetLineWidth(context, 2.0);CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);CGRect rectangle = CGRectMake(60,170,200,80);CGContextAddEllipseInRect(context, rectangle);CGContextStrokePath(context); *//*用紅色填充了一段路徑:CGContextMoveToPoint(context, 100, 100); CGContextAddLineToPoint(context, 150, 150); CGContextAddLineToPoint(context, 100, 200); CGContextAddLineToPoint(context, 50, 150); CGContextAddLineToPoint(context, 100, 100); CGContextSetFillColorWithColor(context, [UIColor redColor].CGColor); CGContextFillPath(context); *//*填充一個藍色邊的紅色矩形 CGContextSetLineWidth(context, 2.0); CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor); CGRect rectangle = CGRectMake(60,170,200,80); CGContextAddRect(context, rectangle); CGContextStrokePath(context); CGContextSetFillColorWithColor(context, [UIColor redColor].CGColor); CGContextFillRect(context, rectangle); *//*畫弧 //弧線的是通過指定兩個切點，還有角度，調用CGContextAddArcToPoint()繪制 CGContextSetLineWidth(context, 2.0); CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor); CGContextMoveToPoint(context, 100, 100); CGContextAddArcToPoint(context, 100,200, 300,200, 100); CGContextStrokePath(context); *//* 繪制貝茲曲線 //貝茲曲線是通過移動一個起始點，然后通過兩個控制點,還有一個中止點，調用CGContextAddCurveToPoint() 函數繪制 CGContextSetLineWidth(context, 2.0);CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);CGContextMoveToPoint(context, 10, 10);CGContextAddCurveToPoint(context, 0, 50, 300, 250, 300, 400);CGContextStrokePath(context); *//*繪制二次貝茲曲線CGContextSetLineWidth(context, 2.0);CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);CGContextMoveToPoint(context, 10, 200);CGContextAddQuadCurveToPoint(context, 150, 10, 300, 200);CGContextStrokePath(context); *//*繪制虛線 CGContextSetLineWidth(context, 5.0);CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);CGFloat dashArray[] = {2,6,4,2};CGContextSetLineDash(context, 3, dashArray, 4);//跳過3個再畫虛線，所以剛開始有6-（3-2）=5個虛點CGContextMoveToPoint(context, 10, 200);CGContextAddQuadCurveToPoint(context, 150, 10, 300, 200);CGContextStrokePath(context); */ /*繪制圖片 NSString* imagePath = [[NSBundle mainBundle] pathForResource:@"dog" ofType:@"png"]; UIImage* myImageObj = [[UIImage alloc] initWithContentsOfFile:imagePath]; //[myImageObj drawAtPoint:CGPointMake(0, 0)]; [myImageObj drawInRect:CGRectMake(0, 0, 320, 480)];NSString *s = @"我的小狗";[s drawAtPoint:CGPointMake(100, 0) withFont:[UIFont systemFontOfSize:34.0]]; *//* NSString *path = [[NSBundle mainBundle] pathForResource:@"dog" ofType:@"png"]; UIImage *img = [UIImage imageWithContentsOfFile:path]; CGImageRef image = img.CGImage; CGContextSaveGState(context); CGRect touchRect = CGRectMake(0, 0, img.size.width, img.size.height); CGContextDrawImage(context, touchRect, image); CGContextRestoreGState(context); *//*NSString *path = [[NSBundle mainBundle] pathForResource:@"dog" ofType:@"png"]; UIImage *img = [UIImage imageWithContentsOfFile:path]; CGImageRef image = img.CGImage; CGContextSaveGState(context);CGContextRotateCTM(context, M_PI); CGContextTranslateCTM(context, -img.size.width, -img.size.height);CGRect touchRect = CGRectMake(0, 0, img.size.width, img.size.height); CGContextDrawImage(context, touchRect, image); CGContextRestoreGState(context);*//* NSString *path = [[NSBundle mainBundle] pathForResource:@"dog" ofType:@"png"]; UIImage *img = [UIImage imageWithContentsOfFile:path]; CGImageRef image = img.CGImage;CGContextSaveGState(context);CGAffineTransform myAffine = CGAffineTransformMakeRotation(M_PI); myAffine = CGAffineTransformTranslate(myAffine, -img.size.width, -img.size.height); CGContextConcatCTM(context, myAffine);CGContextRotateCTM(context, M_PI); CGContextTranslateCTM(context, -img.size.width, -img.size.height);CGRect touchRect = CGRectMake(0, 0, img.size.width, img.size.height); CGContextDrawImage(context, touchRect, image); CGContextRestoreGState(context); */ }

　　

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