(素材源码)猫猫学IOS（三十四）UI之Quartz2D画画板的实现

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地址：http://blog.csdn.net/u013357243?viewmode=contents
源码：http://download.csdn.net/detail/u013357243/8666923

效果：

代码:

NYView

NYView.h

//
//  NYView.h
//  画画板
//
//  Created by apple on 15-5-6.
//  Copyright (c) 2015年 znycat. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface NYView : UIView

- (void)clearView;
- (void)backView;
@end

NYView.m

//
//  NYView.m
//  画画板
//
//  Created by apple on 15-5-6.
//  Copyright (c) 2015年 znycat. All rights reserved.
//

#import "NYView.h"

@interface NYView ()

@property (nonatomic, strong) NSMutableArray *paths;

@end

@implementation NYView

- (NSMutableArray *)paths
{
    if (_paths == nil) {
        _paths = [NSMutableArray array];
    }
    return _paths;
}

// 开始触摸
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

    // 1.获取手指对应UITouch对象
    UITouch *touch = [touches anyObject];
    // 2.通过UITouch对象获取手指触摸的位置
    CGPoint startPoint = [touch locationInView:touch.view];

    // 3.当用户手指按下的时候创建一条路径
    UIBezierPath *path = [UIBezierPath bezierPath];
    // 3.1设置路径的相关属性
    [path setLineJoinStyle:kCGLineJoinRound];
    [path setLineCapStyle:kCGLineCapRound];
    [path setLineWidth:10];


    // 4.设置当前路径的起点
    [path moveToPoint:startPoint];
    // 5.将路径添加到数组中
    [self.paths addObject:path];

}
// 移动
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    // 1.获取手指对应UITouch对象
    UITouch *touch = [touches anyObject];
    // 2.通过UITouch对象获取手指触摸的位置
    CGPoint movePoint = [touch locationInView:touch.view];

    // 3.取出当前的path
    UIBezierPath *currentPaht = [self.paths lastObject];
    // 4.设置当前路径的终点
    [currentPaht addLineToPoint:movePoint];

    // 6.调用drawRect方法重回视图
    [self setNeedsDisplay];

}

// 离开view(停止触摸)
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{

    [self touchesMoved:touches withEvent:event];
    /*
     // 1.获取手指对应UITouch对象
     UITouch *touch = [touches anyObject];
     // 2.通过UITouch对象获取手指触摸的位置
     CGPoint endPoint = [touch locationInView:touch.view];

     // 3.取出当前的path
     UIBezierPath *currentPaht = [self.paths lastObject];
     // 4.设置当前路径的终点
     [currentPaht addLineToPoint:endPoint];

     // 6.调用drawRect方法重回视图
     [self setNeedsDisplay];
     */


}

// 画线
- (void)drawRect:(CGRect)rect
{

    [[UIColor redColor] set];
    // 边路数组绘制所有的线段
    for (UIBezierPath *path in self.paths) {
        [path stroke];
    }

}


- (void)clearView
{
    [self.paths removeAllObjects];
    [self setNeedsDisplay];
}
- (void)backView
{
    [self.paths removeLastObject];
    [self setNeedsDisplay];
}



@end

NYViewController

//
//  NYViewController.m
//  画画板
//
//  Created by apple on 15-5-6.
//  Copyright (c) 2015年 znycat. All rights reserved.
//

#import "NYViewController.h"
#import "NYView.h"
#import "MBProgressHUD+NJ.h"
#import "UIImage+captureView.h"

@interface NYViewController ()
/**
 *  清屏
 */
- (IBAction)clearBtnClick;
/**
 *  回退
 */
- (IBAction)backBtnClick;
/**
 *  保存
 */
- (IBAction)saveBtnClick;

@property (weak, nonatomic) IBOutlet NYView *customView;
@end

@implementation NYViewController

- (IBAction)clearBtnClick {
    [self.customView clearView];
}

- (IBAction)backBtnClick {

    [self.customView backView];
}

- (IBAction)saveBtnClick {

    UIImage *newImage = [UIImage captureImageWithView:self.customView];
    // 4.保存到相册
    UIImageWriteToSavedPhotosAlbum(newImage, 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"];
    }
}

@end

其他的可以在源码中自己看，这两个是最重要的。