画画板 -- 可自定义线的宽度和颜色

Main.storyboard

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3733"/>
    </dependencies>
    <scenes>
        <!--View Controller-->
        <scene sceneID="ufC-wZ-h7g">
            <objects>
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                                    <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
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                                    <color key="titleColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
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                                </state>
                                <connections>
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                                                <nil key="highlightedColor"/>
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                                        <subviews>
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                                            </slider>
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                                        <subviews>
                                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="透明" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="dgr-d3-BGQ">
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                                                <nil key="highlightedColor"/>
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                                            <slider opaque="NO" tag="4" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" value="1" minValue="0.0" maxValue="1" id="Q0N-q5-k79">
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                                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                <connections>
                                                    <action selector="colorChange:" destination="vXZ-lx-hvc" eventType="valueChanged" id="OQx-H5-WJ8"/>
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                                        <subviews>
                                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="画笔粗细" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="268-rh-wkE">
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                                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
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                                                <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                                <nil key="highlightedColor"/>
                                            </label>
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                                                <nil key="highlightedColor"/>
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                                                        <nil key="highlightedColor"/>
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                                                </subviews>
                                                <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                                            </view>
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                                    </view>
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                                <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
                            </view>
                        </subviews>
                        <color key="backgroundColor" red="1" green="0.62925297680000003" blue="0.36846892539999998" alpha="1" colorSpace="calibratedRGB"/>
                    </view>
                    <connections>
                        <outlet property="drawingView" destination="zGs-rQ-Aon" id="Tri-Vv-f4t"/>
                        <outlet property="lineColor" destination="UMA-dn-jTE" id="9YW-pa-5O9"/>
                        <outlet property="lineWidth" destination="LDh-zJ-bDC" id="p1q-pa-tji"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="x5A-6p-PRh" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="57" y="180"/>
        </scene>
    </scenes>
    <simulatedMetricsContainer key="defaultSimulatedMetrics">
        <simulatedStatusBarMetrics key="statusBar"/>
        <simulatedOrientationMetrics key="orientation"/>
        <simulatedScreenMetrics key="destination"/>
    </simulatedMetricsContainer>
</document>

LWTViewController.h

#import <UIKit/UIKit.h>

@interface LWTViewController : UIViewController

@end

LWTViewController.m

//
//  LWTViewController.m
//  画画板精装
//
//  Created by apple on 14-6-14.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTViewController.h"
#import "LWTDrawingView.h"
#import "LWTColorModel.h"
#import "MBProgressHUD+NJ.h"
/**
 *  定义color色值的枚举
 */
typedef enum
{
    KColorChangeRedVale = 1,
    KColorChangeGreenValue,
    KColorChangeBlueValue,
    KColorChangeAlphaValue
} KColorChange;

@interface LWTViewController ()
/**
 *  绘图区的view
 */
@property (weak, nonatomic) IBOutlet LWTDrawingView *drawingView;
/**
 *  颜色的模型
 */
@property (nonatomic, strong) LWTColorModel *currentColor;
/**
 *  预览颜色的label
 */
@property (weak, nonatomic) IBOutlet UILabel *lineColor;
/**
 *  修改线宽的slider
 */
@property (weak, nonatomic) IBOutlet UISlider *lineWidth;
/**
 *  修改绘画的线的线宽
 */
- (IBAction)lineWidthChange:(UISlider *)sender;
/**
 *  改变绘画的线的颜色
 */
- (IBAction)colorChange:(UISlider *)sender;
/**
 *  清屏
 */
- (IBAction)clearScreen;
/**
 *  撤销最后绘画的线
 */
- (IBAction)removeLast;
/**
 *  截屏
 */
- (IBAction)cutScreen;
@end

@implementation LWTViewController

- (void)viewDidLoad{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    /**
     *  创建色值对象
     */
    LWTColorModel *color = [LWTColorModel color];
    self.currentColor = color;
    
    // 设置最大线宽
    self.lineWidth.maximumValue = 20;
}

- (IBAction)lineWidthChange:(UISlider *)sender {
    // 设置绘画的线宽
    self.drawingView.lineWidth = sender.value;
}

- (IBAction)clearScreen {
    [self.drawingView clearPath];
}

- (IBAction)removeLast {
    [self.drawingView backPath];
}

- (IBAction)cutScreen {
    
    UIGraphicsBeginImageContext(self.drawingView.bounds.size);
    
    [self.drawingView.layer renderInContext:UIGraphicsGetCurrentContext()];
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    if (error) {
        [MBProgressHUD showError:@"保存失败"];
    }else
    {
        [MBProgressHUD showSuccess:@"保存成功"];
    }

}

- (IBAction)colorChange:(UISlider *)sender {
    
    switch (sender.tag) {
        case KColorChangeRedVale: // 设置红色的色值
            self.currentColor.redValue = sender.value;
            break;
        case KColorChangeGreenValue: // 设置绿色的色值
            self.currentColor.greenValue = sender.value;
            break;
        case KColorChangeBlueValue: // 设置蓝色的色值
            self.currentColor.blueValue = sender.value;
            break;
        case KColorChangeAlphaValue: // 设置透明度
            self.currentColor.alphaValue = sender.value;
            break;
            
        default:
            break;
    }
    
    // 设置预览的label的背景颜色
    self.lineColor.backgroundColor = [self.currentColor getcurrentColor];
    // 设置要绘画的线的颜色
    self.drawingView.currentColor = [self.currentColor getcurrentColor];
    
}


@end

LWTDrawingView.h

//
//  LWTDrawingView.h
//  画画板精装
//
//  Created by apple on 14-6-14.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface LWTDrawingView : UIView
/**
 *  线宽
 */
@property (nonatomic, assign) CGFloat lineWidth;
/**
 *  线的颜色
 */
@property (nonatomic, strong) UIColor *currentColor;
/**
 *  清屏
 */
- (void)clearPath;
/**
 *  撤销
 */
- (void)backPath;

@end

LWTDrawingView.m

//
//  LWTDrawingView.m
//  画画板精装
//
//  Created by apple on 14-6-14.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTDrawingView.h"

@interface LWTDrawingView ()
/**
 *  存储所有线的路径的数组
 */
@property (nonatomic, strong) NSMutableArray *paths;
/**
 *  存储所有线的颜色的数组
 */
@property (nonatomic, strong) NSMutableArray *colors;

@end

@implementation LWTDrawingView

#pragma mark - 懒加载
- (NSMutableArray *)paths
{
    if (!_paths) {
        _paths = [NSMutableArray array];
    }
    return _paths;
}

- (NSMutableArray *)colors
{
    if (!_colors) {
        _colors = [NSMutableArray array];
    }
    return _colors;
}

- (CGFloat)lineWidth
{
    if (!_lineWidth) {
        _lineWidth = 1;
    }
    return _lineWidth;
}

- (UIColor *)currentColor
{
    if (!_currentColor) {
        _currentColor = [UIColor blackColor];
    }
    return _currentColor;
}

#pragma mark - 重写init
/**
 *  代码创建时加载
 */
- (id)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        [self setup];
    }
    return self;
}
/**
 *  xib或storyboard创建时加载
 */
- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder]) {
        [self setup];
    }
    return self;
}
/**
 *  创建view时添加长按触摸事件
 */
- (void)setup
{
    // 给view添加长按事件
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    // 设置反应时间
    longPress.minimumPressDuration = 0;
    [self addGestureRecognizer:longPress];
}


- (void)drawRect:(CGRect)rect
{
    // 遍历得到所有线的路径
    for (int i = 0; i < self.paths.count; i++) {
        // 线的路径
        UIBezierPath *path = self.paths[i];
        // 线的颜色
        UIColor *currentColor = self.colors[i];
        
        [currentColor set];
        // 绘制线
        [path stroke];
    }
}

// 长按事件
- (void)longPress: (UILongPressGestureRecognizer *)longPress
{
    // 得到当前的触摸点
    CGPoint point = [longPress locationInView:longPress.view];
    // 判断长按的状态
    if ( longPress.state == UIGestureRecognizerStateBegan) {
        // 开始长按
        UIBezierPath *path = [[UIBezierPath alloc] init];
        
        // 设置起点
        [path moveToPoint:point];
        // 设置线的属性
        [path setLineCapStyle:kCGLineCapRound];
        [path setLineJoinStyle:kCGLineJoinRound];
        [path setLineWidth:self.lineWidth];
        
        [self.paths addObject:path];
        [self.colors addObject:self.currentColor];
        
    }else if (longPress.state == UIGestureRecognizerStateChanged || longPress.state == UIGestureRecognizerStateEnded)
    {
        // 移动和结束当前长按状态
        UIBezierPath *path = [self.paths lastObject];
        [path addLineToPoint:point];
    }
    
    // 重载drawRect:方法
    [self setNeedsDisplay];
}

- (void)clearPath
{
    [self.paths removeAllObjects];
    [self.colors removeAllObjects];
    [self setNeedsDisplay];
}

- (void)backPath
{
    [self.paths removeLastObject];
    [self.colors removeLastObject];
    [self setNeedsDisplay];
}


@end

LWTColor.h

#import <UIKit/UIKit.h>

@interface LWTColorModel : UIColor

@property (nonatomic, assign) CGFloat redValue;
@property (nonatomic, assign) CGFloat greenValue;
@property (nonatomic, assign) CGFloat blueValue;
@property (nonatomic, assign) CGFloat alphaValue;

- (UIColor *)getcurrentColor;

+ (instancetype)color;

@end

LWTColor.m

//
//  LWTColor.m
//  画画板精装
//
//  Created by apple on 14-6-14.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTColorModel.h"

@interface LWTColorModel ()

@end

@implementation LWTColorModel


- (CGFloat)alphaValue
{
    if(!_alphaValue)
    {
        _alphaValue = 1.0;
    }
    return _alphaValue;
}

- (UIColor *)getcurrentColor
{
    
    return [UIColor colorWithRed:self.redValue/255.f green:self.greenValue/255.f blue:self.blueValue/255.f alpha:self.alphaValue];
}

+ (instancetype)color
{
    return [[self alloc] init];
}


@end