demo功能：三種顏色畫筆和橡皮擦的畫圖板demo 【iphone 6.1 測試通過】

demo說明：項目中PaintView.m 是demo的畫板部分，PaintView和三個顏色按鈕添加到ViewController的view中。構(gòu)成程序主界面。

demo截屏：

demo主要代碼：PaintView.m 畫板view部分

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#import "PaintView.h" #import <QuartzCore/QuartzCore.h>@implementation PaintView @synthesize paintColor = _paintColor; @synthesize erase; - (id)initWithFrame:(CGRect)frame {self = [super initWithFrame:frame];if (self) {self.layer.shadowColor = [UIColor blackColor].CGColor;self.layer.shadowOpacity = 0.8;self.layer.shadowOffset = CGSizeMake(5, 5);self.backgroundColor = [UIColor whiteColor];self.paintColor = [UIColor blackColor];// Initialization codelinesArray = [[NSMutableArray alloc]init];UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:selfaction:@selector(panGesture:)];[self addGestureRecognizer:panGesture];[panGesture release];}return self; }- (void)dealloc {[linesArray release];[_paintColor release];[super dealloc]; }// Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. - (void)drawRect:(CGRect)rect {// Drawing codeCGContextRef context = UIGraphicsGetCurrentContext();CGContextSetLineWidth(context, 20);//NSLog(@"color:%@",_paintColor);for (NSDictionary *lineDic in linesArray) {UIColor *lineColor = [lineDic objectForKey:@"color"];CGContextSetStrokeColorWithColor(context, lineColor.CGColor);CGMutablePathRef paintPath = CGPathCreateMutable();NSArray *linePointArray = [lineDic objectForKey:@"line"];for (NSInteger i=0; i<linePointArray.count; i++) {CGPoint point = [[linePointArray objectAtIndex:i]CGPointValue];if (i==0) {//CGContextMoveToPoint(context, point.x, point.y);CGPathMoveToPoint(paintPath, NULL, point.x, point.y);}else {//CGContextAddLineToPoint(context, point.x, point.y);CGPathAddLineToPoint(paintPath, NULL, point.x, point.y);}}CGContextAddPath(context, paintPath);CGContextStrokePath(context);if ([lineDic objectForKey:@"eraseArray"]) {//NSLog(@"color:%@",lineColor);NSMutableArray *eraseArray = [lineDic objectForKey:@"eraseArray"];CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);CGMutablePathRef paintPath = CGPathCreateMutable();for (NSInteger i=0; i<eraseArray.count; i++) {CGPoint point = [[eraseArray objectAtIndex:i]CGPointValue];//NSLog(@"erase point:%@",NSStringFromCGPoint(point));if (i==0) {//CGContextMoveToPoint(context, point.x, point.y);CGPathMoveToPoint(paintPath, NULL, point.x, point.y);}else {//CGContextAddLineToPoint(context, point.x, point.y);CGPathAddLineToPoint(paintPath, NULL, point.x, point.y);}}CGContextAddPath(context, paintPath);CGContextStrokePath(context);}} }-(void)panGesture:(UIPanGestureRecognizer*)thePan{CGPoint touchPoint = [thePan locationInView:self];if (self.erase) {if (thePan.state==UIGestureRecognizerStateChanged) {for (NSMutableDictionary *lineDic in linesArray) {NSMutableArray *linePointArray = [lineDic objectForKey:@"line"];for (NSInteger i=0; i<linePointArray.count; i++) {CGPoint point = [[linePointArray objectAtIndex:i]CGPointValue];CGFloat distance = powf(point.x-touchPoint.x,point.y-touchPoint.y);if (distance<20) {NSMutableArray *eraseArray;if ([lineDic objectForKey:@"eraseArray"]) {eraseArray = [lineDic objectForKey:@"eraseArray"];}else {eraseArray = [NSMutableArray array];}[eraseArray addObject:[NSValue valueWithCGPoint:touchPoint]];[lineDic setObject:eraseArray forKey:@"eraseArray"];CGRect paintRect = CGRectMake(touchPoint.x-50, touchPoint.y-50, 100, 100);[self setNeedsDisplayInRect:paintRect];//[self setNeedsDisplay];continue;}}}}//[self eraseLine:currentLineDic erase:[thePan locationInView:self]];}else {if (thePan.state==UIGestureRecognizerStateBegan) {NSMutableArray *currentLineArray = [NSMutableArray arrayWithObject:[NSValue valueWithCGPoint:touchPoint]];NSMutableDictionary *lineDic = [NSMutableDictionary dictionaryWithObjectsAndKeys:currentLineArray,@"line",_paintColor,@"color", nil];[linesArray addObject:lineDic];}else if(thePan.state==UIGestureRecognizerStateChanged){NSMutableDictionary *lineDic = [linesArray lastObject];NSMutableArray *currentLineArray = [lineDic objectForKey:@"line"];[currentLineArray addObject:[NSValue valueWithCGPoint:touchPoint]];CGRect paintRect = CGRectMake(touchPoint.x-50, touchPoint.y-50, 100, 100);[self setNeedsDisplayInRect:paintRect];}else if(thePan.state==UIGestureRecognizerStateEnded){}} } @end

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demo下載地址：http://download.csdn.net/detail/donny_zhang/5572237

轉(zhuǎn)載于:https://www.cnblogs.com/snake-hand/archive/2013/06/13/3134585.html

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