1 // 2 // PaintView.m 3 // IOS_0224_涂鸦 4 // 5 // Created by ma c on 16/2/24. 6 // Copyright © 2016年 博文科技. All rights reserved. 7 // 8 9 #import "PaintView.h" 10 11 @interface PaintView () 12 13 //存放每次触摸的完整路径 14 @property (nonatomic, strong) NSMutableArray *path; 15 16 @end 17 18 @implementation PaintView 19 20 - (NSMutableArray *)path 21 { 22 if (_path == nil) { 23 _path = [NSMutableArray array]; 24 } 25 return _path; 26 } 27 28 /*方法一*/ 29 /* 30 //确定起点 31 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event 32 { 33 UITouch *touch = [touches anyObject]; 34 CGPoint startPoint = [touch locationInView:touch.view]; 35 36 //每次开始触摸，就新建一个数组来存放这次触摸的所有点 37 NSMutableArray *pathPoints = [NSMutableArray array]; 38 [pathPoints addObject:[NSValue valueWithCGPoint:startPoint]]; 39 //添加每次触摸的所有点形成的路径到path中 40 [self.path addObject:pathPoints]; 41 42 [self setNeedsDisplay]; 43 } 44 //连线 45 - (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event 46 { 47 UITouch *touch = [touches anyObject]; 48 CGPoint currentPoint = [touch locationInView:touch.view]; 49 50 //取出这次路径对应的数组 51 NSMutableArray *pathPoints = [self.path lastObject]; 52 [pathPoints addObject:[NSValue valueWithCGPoint:currentPoint]]; 53 54 [self setNeedsDisplay]; 55 56 } 57 //结束点 58 - (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event 59 { 60 UITouch *touch = [touches anyObject]; 61 CGPoint endPoint = [touch locationInView:touch.view]; 62 63 //取出这次路径对应的数组 64 NSMutableArray *pathPoints = [self.path lastObject]; 65 [pathPoints addObject:[NSValue valueWithCGPoint:endPoint]]; 66 67 [self setNeedsDisplay]; 68 69 } 70 71 - (void)drawRect:(CGRect)rect { 72 CGContextRef ctx = UIGraphicsGetCurrentContext(); 73 74 for (NSMutableArray *points in self.path) { 75 for (int i = 0; i < points.count; i++) { //一条路径 76 77 CGPoint point = [points[i] CGPointValue]; 78 79 if (i == 0) { 80 CGContextMoveToPoint(ctx, point.x, point.y); 81 }else{ 82 CGContextAddLineToPoint(ctx, point.x, point.y); 83 } 84 } 85 } 86 87 CGContextSetLineCap(ctx, kCGLineCapRound); 88 CGContextSetLineJoin(ctx, kCGLineJoinRound); 89 CGContextSetLineWidth(ctx, 5); 90 CGContextStrokePath(ctx); 91 } 92 93 */ 94 95 /*方法二*/ 96 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event 97 { 98 //1.获得当前触摸点 99 UITouch *touch = [touches anyObject]; 100 CGPoint startPoint = [touch locationInView:touch.view]; 101 //2.创建一个新的路径 102 UIBezierPath *startPath = [UIBezierPath bezierPath]; 103 104 startPath.lineWidth = 5; 105 startPath.lineCapStyle = kCGLineCapRound; 106 startPath.lineJoinStyle = kCGLineJoinRound; 107 //设置起点 108 [startPath moveToPoint:startPoint]; 109 //3.添加路径到数组中 110 [self.path addObject:startPath]; 111 112 [self setNeedsDisplay]; 113 114 } 115 116 - (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event 117 { 118 UITouch *touch = [touches anyObject]; 119 CGPoint currentPoint = [touch locationInView:touch.view]; 120 121 UIBezierPath *currentPath = [self.path lastObject]; 122 [currentPath addLineToPoint:currentPoint]; 123 124 [self setNeedsDisplay]; 125 } 126 127 - (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event 128 { 129 [self touchesMoved:touches withEvent:event]; 130 131 } 132 133 - (void)drawRect:(CGRect)rect 134 { 135 [[UIColor redColor] set]; 136 for (UIBezierPath *path in self.path) { 137 [path stroke]; 138 } 139 } 140 141 - (void)clear 142 { 143 [self.path removeAllObjects]; 144 [self setNeedsDisplay]; 145 } 146 147 - (void)back 148 { 149 [self.path removeLastObject]; 150 [self setNeedsDisplay]; 151 } 152 153 @end