涂鸦板

///controller

//
//  ViewController.m
//  PaintBoard
//
//  Created by DukeMou on 15/4/22.
//  Copyright (c) 2015年 河南蓝鸥科技有限公司. All rights reserved.
//

#import "RootViewController.h"
#import "PaintView.h"

@interface RootViewController ()

@property (nonatomic, retain) UITextField *textField;//使用其自定义输入视图
- (UIView *)_createFunctionPad;//创建功能按钮的控制视图

@end

@implementation RootViewController

- (void)dealloc {
    [_textField release];
    [super dealloc];
}

- (UIView *)_createFunctionPad {
    NSArray *titles = @[@"减细", @"加粗", @"撤销", @"清空", @"颜色"];
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 80)];
    for (int i = 0; i < titles.count; i++) {
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        //给按钮设置标题
        [button setTitle:titles[i] forState:UIControlStateNormal];
        button.backgroundColor = [UIColor colorWithRed:arc4random() % 256 / 255.0 green:arc4random() % 256 / 255.0 blue:arc4random() % 256 / 255.0 alpha:0.8];
        button.showsTouchWhenHighlighted = YES;
        [button addTarget:self action:@selector(handleButtonAction:) forControlEvents:UIControlEventTouchUpInside];
        //设置tag值
        button.tag = 100 + i;
        //设置frame
        CGFloat delta_x = (view.bounds.size.width - titles.count * 60) / (titles.count + 1);
        button.frame = CGRectMake((delta_x + 60) * i + delta_x, 10, 60, 60);
        button.layer.cornerRadius = 30;
        //添加在view上显示
        [view addSubview:button];
    }
    return [view autorelease];
}

- (UITextField *)textField {
    if (!_textField) {
        self.textField = [[UITextField alloc] initWithFrame:CGRectZero];
        //通过调用私有方法为textField添加输入视图
        _textField.inputView = [self _createFunctionPad];
        [self.view addSubview:_textField];
    }
    return _textField;
}


- (void)loadView {
    PaintView *paintView = [[PaintView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    paintView.backgroundColor = [UIColor whiteColor];
    self.view = paintView;
    [paintView release];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    UIButton *menuButton = [UIButton buttonWithType:UIButtonTypeSystem];
    menuButton.frame = CGRectMake(self.view.bounds.size.width - 60, 40, 40, 40);
    [menuButton setImage:[[UIImage imageNamed: @"屏幕快照 2015-09-19 11.44.30.png"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal ] forState:UIControlStateNormal];
   
    [menuButton setTitle:@"菜单" forState:UIControlStateNormal];
    [menuButton addTarget:self action:@selector(handleMenuButtonAction:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:menuButton];
   
}

- (void)handleMenuButtonAction:(UIButton *)sender {
    //判断如果textField是第一响应者则撤销第一响应者权限，否则让其成为第一响应者
    if ([self.textField isFirstResponder]) {
        [self.textField resignFirstResponder];
    } else {
        [self.textField becomeFirstResponder];
    }
}

- (void)handleButtonAction:(UIButton *)sender {
   
    PaintView *paintView = (PaintView *)self.view;
   
    switch (sender.tag) {
        case 100:
            if (paintView.strokWidth > 4) {
                paintView.strokWidth -= 2;
            }
            break;
        case 101:
            paintView.strokWidth += 2;
            break;
        case 102:
            [paintView undoLastDrawing];
            break;
        case 103:
            [paintView cleanPaintBoard];
            break;
        case 104:
            sender.backgroundColor = [UIColor colorWithRed:arc4random() % 256 / 255.0 green:arc4random() % 256 / 255.0 blue:arc4random() % 256 / 255.0 alpha:0.8];
            paintView.strokColor = sender.backgroundColor;
            break;
        default:
            break;
    }
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

//view

//.h

@interface PaintView : UIView

@property (nonatomic, retain) NSMutableArray *allLines;//用于保存所有已经绘制的线条对象
@property (nonatomic, retain) UIColor *strokColor;//画笔颜色
@property (nonatomic, assign) CGFloat strokWidth;//画笔宽度

- (void)undoLastDrawing;//撤销上一次画线
- (void)cleanPaintBoard;//清空画板

@end

//.m

//
//  PaintView.m
//  PaintBoard
//
//  Created by DukeMou on 15/4/22.
//  Copyright (c) 2015年 河南蓝鸥科技有限公司. All rights reserved.
//

#import "PaintView.h"
#import "Line.h"

@implementation PaintView

- (void)dealloc {
    [_allLines release];
    [_strokColor release];
    [super dealloc];
}

- (NSMutableArray *)allLines {
    if (!_allLines) {
        self.allLines = [NSMutableArray array];
    }
    return _allLines;
}

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        //在初始化方法中设置默认的画笔颜色和画笔宽度
        self.strokColor = [UIColor blackColor];
        self.strokWidth = 2;
    }
    return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *aTouch = [touches  anyObject];
    //获取线条的起始点
    CGPoint startPoint = [aTouch locationInView:self.superview];
    //创建一个贝塞尔曲线对象
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path setLineCapStyle:kCGLineCapRound];
    [path setLineJoinStyle:kCGLineJoinRound];
    //保存起始点
    [path moveToPoint:startPoint];
    //创建数据模型对象，记录当前线条信息
    Line *aLine = [Line line];
    aLine.path = path;
    aLine.color = self.strokColor;
    aLine.width = self.strokWidth;
    //保存在数组中
    [self.allLines addObject:aLine];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *aTouch = [touches anyObject];
    CGPoint currentPoint = [aTouch locationInView:self];
    //获取当前的Line对象
    Line *currentLine = self.allLines.lastObject;
    //为当前的Line添加新的路径点
    [currentLine.path addLineToPoint:currentPoint];
    //通知视图绘制当前界面
    [self setNeedsDisplay];
}


// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
    for (Line *aLine in self.allLines) {
        [aLine.color setStroke];//设置绘制用的画笔颜色
        aLine.path.lineWidth = aLine.width;//设置线条宽度
        [aLine.path stroke];//根据路径信息绘制线条
    }
}

- (void)undoLastDrawing {
    //删除数组中最后一条线条对象
    [self.allLines removeLastObject];
    //然后重绘界面
    [self setNeedsDisplay];
}

- (void)cleanPaintBoard {
    [self.allLines removeAllObjects];
    [self setNeedsDisplay];
}

@end

//model

//.h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface Line : NSObject

@property (nonatomic, retain) UIBezierPath *path;//记录线条路径
@property (nonatomic, retain) UIColor *color;//线条颜色
@property (nonatomic, assign) CGFloat width;//线条宽度

+ (id)line;//便利构造器方法

@end

//.m

#import "Line.h"

@implementation Line

- (void)dealloc {
    [_path release];
    [_color release];
    [super dealloc];
}

+ (id)line {
    return [[[Line alloc] init] autorelease];
}

@end