简单⼯工⼚厂模式 (Simple Factory Pattern)

@interface ViewController ()

{

    Shape *_shape;

}



@end



@implementation ViewController



- (void)loadView

{

    //设置画板

    self.view=[[SimpleDrawBoard alloc]init];

    self.view.backgroundColor=[UIColor whiteColor];

}

- (void)viewDidLoad {

    [super viewDidLoad];

    

}



- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

    UITouch *touch=[touches anyObject];

    CGPoint point=[touch locationInView:self.view];

    //工厂生产形状

    _shape=[Factory shapeWithType:kRud];

//    _shape.fillColor=[UIColor blackColor];

    [_shape addPoint:point];

}



- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

{

    UITouch *touch=[touches anyObject];

    CGPoint point=[touch locationInView:self.view];

    SimpleDrawBoard *board=(SimpleDrawBoard *)self.view;

    [_shape addPoint:point];

    [board drawShape:_shape];

}



 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

{

    UITouch *touch=[touches anyObject];

    CGPoint point=[touch locationInView:self.view];

    [_shape addPoint:point];

    SimpleDrawBoard *board=(SimpleDrawBoard *)self.view;

    [board drawShape:_shape];

}





//

//  SimpleDrawBoard.m

//  Facetory-0904

//

//  Created by apple on 14-9-4.

//  Copyright (c) 2014年 apple. All rights reserved.

//



#import "SimpleDrawBoard.h"

@interface SimpleDrawBoard()

{

    Shape *_shape;

}

@end



@implementation SimpleDrawBoard



- (instancetype)initWithFrame:(CGRect)frame

{

    self = [super initWithFrame:frame];

    if (self) {

        // Initialization code

    }

    return self;

}





// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect

{

    CGContextRef context=UIGraphicsGetCurrentContext();

    [_shape draw:context];

}



- (void)drawShape:(Shape *)shape

{

    _shape=shape;

    [self setNeedsDisplay];

}



@end







//

//  Shape.m

//  Facetory-0904

//

//  Created by apple on 14-9-4.

//  Copyright (c) 2014年 apple. All rights reserved.

//



#import "Shape.h"





@implementation Shape



- (void)addPoint:(CGPoint)point

{

    [self doesNotRecognizeSelector:_cmd];

}



- (void)draw:(CGContextRef)context

{

    if (_fillColor)

    {

        [_fillColor setFill];

    }

    if (_lineWidth)

    {

        CGContextSetLineWidth(context, _lineWidth);

    }

    if (_strokColor)

    {

        [_strokColor setStroke];

    }

}

@end





//

//  Rud.m

//  SimpleDrawBoard

//

//  Created by apple on 14-9-4.

//  Copyright (c) 2014年 戴维营教育. All rights reserved.

//



#import "Rud.h"

#include "math.h"



@interface Rud ()

{

    CGPoint _startPoint;

    CGPoint _endPoint;

    CGFloat rid;

    BOOL bEnd;

}

@end



@implementation Rud

- (void)addPoint:(CGPoint)position

{

    if (!bEnd) {

        _startPoint = position;

        bEnd = YES;

    }

    else {

        _endPoint = position;

        CGFloat r=(_endPoint.x - _startPoint.x)*(_endPoint.x - _startPoint.x)+(_endPoint.y - _startPoint.y)*(_endPoint.y - _startPoint.y);

        rid=sqrtf(r);

    }

}



- (void)draw:(CGContextRef)context

{

    [super draw:context];

    CGRect rect = CGRectMake(_startPoint.x-rid, _startPoint.y-rid,rid*2,rid*2);

    

    CGContextAddEllipseInRect(context, rect);

    CGContextDrawPath(context, kCGPathEOFillStroke);

}

@end