iOS涂鸦-自由画笔可以用到的代码

来源：互联网发布：linux 定时器状态编辑：程序博客网时间：2024/05/16 02:07

1.线段模用来存储线段信息

////  Line.h//  线段模型#import <UIKit/UIKit.h>@interface Line : NSObject/** *  线条所包含的所有点 */@property (nonatomic,strong)NSMutableArray <__kindof NSValue *>*linePoints;/** *  线条的颜色 */@property (nonatomic,strong)UIColor *lineColor;/** *  线条的粗细 */@property (nonatomic,assign)NSInteger lineWidth;@end

#import "Line.h"@implementation Line- (instancetype)init{    if (self=[super init]) {        self.linePoints = [NSMutableArray array];    }        return self;}@end

2.自定义控件

////  DrawLine.h//  创建一个直线#import <UIKit/UIKit.h>@interface DrawLine : UIView/** *  线的颜色(用于接收外部传进来的颜色) */@property (nonatomic, strong) UIColor *lineColor;/** *  线宽(用于接收外部传进来) */@property (nonatomic, assign) NSInteger lineWidth;@end

////  DrawLine.m#import "DrawLine.h"#import "Line.h"@interface DrawLine()/** *  存放所有线条的信息(颜色、坐标、宽度) */@property(nonatomic,strong)NSMutableArray *allLineInfos;@end@implementation DrawLine- (NSMutableArray *)lineInfos{    if (_allLineInfos == nil) {        _allLineInfos = [NSMutableArray array];    }    return _allLineInfos;}/** *  从代码创建控件会调用(这个方法里做一次性初始化设置) */- (instancetype)initWithFrame:(CGRect)frame{    if (self = [super initWithFrame:frame]) {        self.backgroundColor = [UIColor clearColor];        self.lineWidth = 2;        self.lineColor = [UIColor redColor];    }    return self;}#pragma mark - touche/** *  开始触摸 */- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    // 1.取出UITouch对象    UITouch *touch=[touches anyObject];        // 2.创建一个线条信息模型    Line *info = [Line new];    info.lineColor = self.lineColor;    info.lineWidth = self.lineWidth;    [info.linePoints addObject:[NSValue valueWithCGPoint:[touch locationInView:self]]];        // 3.把该线条信息模型添加到数组    [self.allLineInfos addObject:info];        // 4.重绘    [self setNeedsDisplay];}/** *  触摸点一直在移动就会调用 */- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    // 1.取出所有point    NSArray* MovePointArray=[touches allObjects];        // 2.取出最新添加的一个线段信息模型    Line *lastInfo = [self.lineInfos lastObject];        // 3.给这个模型的linePoints属性添加值    [lastInfo.linePoints addObject:[NSValue valueWithCGPoint:[[MovePointArray objectAtIndex:0] locationInView:self]]];        // 4.重绘    [self setNeedsDisplay];}#pragma mark - 绘制/** *  根据现有的线条绘制相应的图形 */- (void)drawRect:(CGRect)rect{    CGContextRef context=UIGraphicsGetCurrentContext();    CGContextSetLineCap(context, kCGLineCapRound);    CGContextSetLineJoin(context, kCGLineJoinRound);        if (self.allLineInfos.count>0) {        for (int i=0; i<[self.allLineInfos count]; i++) {            Line *info = self.allLineInfos[i];                        CGContextBeginPath(context);            CGPoint myStartPoint=[[info.linePoints objectAtIndex:0] CGPointValue];            CGContextMoveToPoint(context, myStartPoint.x, myStartPoint.y);                        if (info.linePoints.count>1) {                for (int j=0; j<[info.linePoints count]-1; j++) {                    CGPoint myEndPoint=[[info.linePoints objectAtIndex:j+1] CGPointValue];                    CGContextAddLineToPoint(context, myEndPoint.x,myEndPoint.y);                }            }else {                CGContextAddLineToPoint(context, myStartPoint.x,myStartPoint.y);            }//            CGContextSetStrokeColorWithColor(context, info.lineColor.CGColor);            CGContextSetLineWidth(context, info.lineWidth);                        // 定义阴影            NSShadow* shadow4 = [[NSShadow alloc] init];            [shadow4 setShadowColor: info.lineColor];            [shadow4 setShadowOffset: CGSizeMake(0.0, 0.0)];            [shadow4 setShadowBlurRadius: info.lineWidth * 1.2];                        // 绘制阴影            CGContextSaveGState(context);            CGContextSetShadowWithColor(context, shadow4.shadowOffset, shadow4.shadowBlurRadius, [shadow4.shadowColor CGColor]);            [[UIColor colorWithRed:245/255.0 green:255/255.0 blue:243/255.0 alpha:1.0] setStroke];                        CGContextStrokePath(context);        }    }}@end

3.控制器里如何使用？

 DrawLine *line = [[DrawLine alloc]initWithFrame:CGRectMake(0, 0, screenW, screenH)];    line.lineWidth = self.currentWidth;    line.lineColor = self.currentColor;    [self.bgView addSubview:line];

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