//
//ViewController.m
//绘画--画板（作业）
//
#import"ViewController.h"
#import"DrawView.h"
#define kScreenWidth [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height
@interfaceViewController()
{
DrawView*drawView;
UIImage* sendImg;
}
@property(weak,nonatomic)IBOutletUIButton*clearButton;
@property(weak,nonatomic)IBOutletUIButton*undoButton;
@property(weak,nonatomic)IBOutletUIButton*eraserButton;
@property(weak,nonatomic)IBOutletUISlider*widthSlider;
@end
@implementationViewController
- (void)viewDidLoad {
[superviewDidLoad];
drawView= [[DrawViewalloc]initWithFrame:CGRectMake(0,70,kScreenWidth,kScreenHeight-190)];
drawView.backgroundColor= [UIColorgrayColor];
[self.viewaddSubview:drawView];
//NSLog(@"%@",NSHomeDirectory());获得路径是使用
}
- (IBAction)clearButtonAction:(UIButton*)sender {
[drawView.linesremoveAllObjects];
[drawViewsetNeedsDisplay];
}
- (IBAction)undoButtonAction:(UIButton*)sender {
[drawView.linesremoveLastObject];
[drawViewsetNeedsDisplay];
}
- (IBAction)eraserButtonAction:(UIButton*)sender {
drawView.color= [UIColorgrayColor];
drawView.lineWidth=15;
}
- (IBAction)saveButtonAction:(UIButton*)sender {
[selfselectView];
//将新图片写到桌面上
NSString*filePath =@"/Users/wuxujian/Desktop/mm.png";
NSData*imgData =UIImageJPEGRepresentation(sendImg,1);
[imgDatawriteToFile:filePathatomically:YES];
//存储到相册
UIImageWriteToSavedPhotosAlbum(sendImg,self,@selector(image:didFinishSavingWithError:contextInfo:),nil);
}
- (void)image:(UIImage*)image didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo;{
NSLog(@"保存图片成功");
}
//截取图片
-(UIImage*)selectView{
UIGraphicsBeginImageContext(drawView.bounds.size);
[drawView.layerrenderInContext:UIGraphicsGetCurrentContext()];
UIImage*viewImg =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndPDFContext();
CGImageRefimageRef = viewImg.CGImage;
CGRectrect =CGRectMake(drawView.frame.origin.x,drawView.frame.origin.y,drawView.frame.size.width,drawView.frame.size.height);
CGImageRefrefImgRef =CGImageCreateWithImageInRect(imageRef, rect);
sendImg= [[UIImagealloc]initWithCGImage:refImgRef];
returnsendImg;
}
- (IBAction)greenButtonAction:(UIButton*)sender {
drawView.color=[UIColorgreenColor];
}
- (IBAction)redButtonAction:(UIButton*)sender {
drawView.color=[UIColorredColor];
}
- (IBAction)blueButtonAction:(UIButton*)sender {
drawView.color=[UIColorblueColor];
}
- (IBAction)widthSliderAction:(UISlider*)sender {
drawView.lineWidth=_widthSlider.value/_widthSlider.maximumValue*10+1;
}
@end
//LineModel.h
//绘画--画板（作业）
//
#import
#import
#import
@interfaceLineModel :NSObject
@property(assign,nonatomic)CGMutablePathRefpath;//路径
//颜色
@property(strong,nonatomic)UIColor*color;
//宽度
@property(assign,nonatomic)CGFloatwidth;
@end
//LineModel.m
//绘画--画板（作业）
//
#import"LineModel.h"
@implementationLineModel
-(void)setPath:(CGMutablePathRef)path{
if(_path!= path) {
CGPathRelease(_path);
CGPathRetain(path);
_path= path;
}
}
- (void)dealloc {
CGPathRelease(_path);
}
@end
//DrawView.h
//绘画--画板（作业）
//
#import
@interfaceDrawView :UIView
@property(strong,nonatomic)UIColor*color;
@property(assign,nonatomic)CGFloatlineWidth;
//使用一个可变数组，来管理所有的线
@property(strong,nonatomic)NSMutableArray*lines;
@end
//DrawView.m
//绘画--画板（作业）
//
#import"DrawView.h"
#import"LineModel.h"
@interfaceDrawView()
{
CGMutablePathRef_linePath;
LineModel*line;
////使用一个可变数组，来管理所有的线
//NSMutableArray *_lines;
}
@end
@implementationDrawView
- (instancetype)initWithFrame:(CGRect)frame {
self= [superinitWithFrame:frame];
if(self) {
self.backgroundColor= [UIColorwhiteColor];
_lines= [NSMutableArrayarray];
_color= [UIColorblackColor];
_lineWidth=3;
}
returnself;
}
//1记录手指移动的轨迹
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent*)event {
//创建路径
_linePath=CGPathCreateMutable();
//设置起始点
UITouch*touch = [touchesanyObject];
CGPointlocation = [touchlocationInView:self];
CGPathMoveToPoint(_linePath,NULL, location.x, location.y);
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent*)event {
//向路径中添加点
UITouch*touch = [touchesanyObject];
CGPointlocation = [touchlocationInView:self];
CGPathAddLineToPoint(_linePath,NULL, location.x, location.y);
[selfsetNeedsDisplay];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent*)event {
//将当前画完的线条加入到数组中去
line= [[LineModelalloc]init];
line.path=_linePath;
line.color=_color;
line.width=_lineWidth;
[_linesaddObject:line];
CGPathRelease(_linePath);
_linePath=NULL;
//绘制线条
[selfsetNeedsDisplay];
}
//2绘制图形界面
- (void)drawRect:(CGRect)rect {
//获取图形上下文
CGContextRefcontext =UIGraphicsGetCurrentContext();
//绘制数组中储存的线条
for(LineModel*lineModelin_lines) {
CGContextSetLineWidth(context, lineModel.width);
[lineModel.colorsetStroke];
//绘制路径
CGContextAddPath(context, lineModel.path);
CGContextDrawPath(context,kCGPathStroke);
}
//全局变量中储存的线条
if(_linePath==NULL) {
return;
}
//绘制路径
CGContextAddPath(context,_linePath);
CGContextDrawPath(context,kCGPathStroke);
}
@end
