2016

2016

一：自定义view .h文件中代码如下

#import <UIKit/UIKit.h>@interface ZLpaintView : UIView
@property(nonatomic, strong) UIColor *currentColor;
- (void)back;
- (void)clear;
- (void)savetoFile:(NSString *)file;@end

.m中如下

#import "ZLpaintView.h"
@interface ZLpaintView()//用于存放 存放某条线的点 的数组
@property (nonatomic, strong) NSMutableArray *pointsOfAllLines;
//用于存放每条线的颜色
@property (nonatomic, strong) NSMutableArray *colorsOfAllLines;@end@implementation ZLpaintView
- (NSMutableArray *)pointsOfAllLines
{if (!_pointsOfAllLines) {_pointsOfAllLines = [NSMutableArray array];}return _pointsOfAllLines;
}
- (NSMutableArray *)colorsOfAllLines
{if (!_colorsOfAllLines) {_colorsOfAllLines = [NSMutableArray array];}return _colorsOfAllLines;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {// Drawing codeCGContextRef context = UIGraphicsGetCurrentContext();
//    设置线宽和收尾及连接点的样式CGContextSetLineWidth(context, 8);CGContextSetLineCap(context,  kCGLineCapRound);CGContextSetLineJoin(context, kCGLineJoinRound);
//    遍历所有线NSInteger countOfLines = unt;//        取出每条线for (NSInteger i = 0; i < countOfLines; i ++) {NSArray *pointsOfline =  self.pointsOfAllLines[i];NSInteger countOfPoints = unt;//设置这条线的颜色//取出对应线的颜色UIColor *currentColor = lorsOfAllLines[i];[currentColor set];//遍历这条线里的两个点for (NSInteger j = 0; j < countOfPoints; j ++) {CGPoint location = [pointsOfline[j] CGPointValue];if (j == 0) {CGContextMoveToPoint(context,location.x,location.y);}else{CGContextAddLineToPoint(context,location.x,location.y);}}CGContextStrokePath(context);//每画完一条线，渲染一次
    }}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
//    一触摸屏幕，就建立一个数组用于存储一条线的点。NSMutableArray *pointsOfLine = [NSMutableArray array];
//  生成线后，将他的对应颜色也放进数组里if (!self.currentColor) {self.currentColor = [UIColor blackColor];//如果当前颜色为空，则设置黑色
        [lorsOfAllLines addObject:self.currentColor];}else{[lorsOfAllLines addObject:self.currentColor];//否则直接加入到这个数组中
    }
//    将生成的数组存放在自己属性数组中。
    [self.pointsOfAllLines addObject:pointsOfLine];}
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{UITouch *touch = [touches anyObject];CGPoint location = [touch locationInView:[touch view]];
//    NSLog(@"%@",[NSValue valueWithCGPoint:location]);NSMutableArray * pointsOfLine = [self.pointsOfAllLines lastObject];[pointsOfLine addObject:[NSValue valueWithCGPoint:location]];NSLog(@"%@",pointsOfLine);[self setNeedsDisplay];
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{NSLog(@"%ld",unt);
}
- (void)back
{[self.pointsOfAllLines removeLastObject];[self setNeedsDisplay];
}
- (void)clear
{[self.pointsOfAllLines removeAllObjects];[self setNeedsDisplay];
}
- (void)savetoFile:(NSString *)file
{UIGraphicsBeginImageContext(self.bounds.size);[self.layer renderInContext:UIGraphicsGetCurrentContext()];UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();NSData *imageDate = UIImagePNGRepresentation(newImage);[imageDate writeToFile:file atomically:YES];
}
@end

二：在storyboard拖相应控件，并在控制器中实现相应地方法，代码如下:

#import "ViewController.h"
#import "ZLpaintView.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet ZLpaintView *paintView;
- (IBAction)backClick;
- (IBAction)clearClick;
- (IBAction)saveClick;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.
}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}- (IBAction)backClick {[self.paintView back];
}- (IBAction)clearClick {[self.paintView clear];NSLog(@"%@",self.paintView.currentColor);
}- (IBAction)saveClick {[self.paintView savetoFile:@"/Users/mac/Desktop/TheImage.png"];
}
- (IBAction)colorBtnClick:(UIButton *)sender
{//    设置当前的颜色self.paintView.currentColor = sender.backgroundColor;
}
@end

三：效果：

转载于:.html