一,程序布局整理
前言://1,程序启动//2,程序流程框架//3,程序界面一致//4,程序界面功能,
//这里只做页面的固定功能, //在首次创建界面时,我们会指定好固定事件触发前的固定方法 //至于另外程序启动后,运行过程中会添加和减少的事件触发的方法,我们会在另外一个"刷新"方法内实现
在上面7大视图中添加按钮事件,这些事件写在所有外观布局代码的最下边,例如在editScene视图中,我们把所有的事件都写在如下内容处,其余视图中的事件按此方式来写
//------------------------------------------------------------------------------------------
//返回按钮功能
[leftButton addTarget:self action:@selector(editSceneBackMainScene:) forControlEvents:UIControlEventTouchUpInside];
//保存按钮功能
[rightButton addTarget:self action:@selector(editSceneBackMainScene:) forControlEvents:UIControlEventTouchUpInside];
//背景颜色按钮的功能
[backgroundButton addTarget:self action:@selector(editSceneToBgColorScene:) forControlEvents:UIControlEventTouchUpInside];
//画笔颜色按钮的功能
[midButton addTarget:self action:@selector(editSceneToLineColorScene:) forControlEvents:UIControlEventTouchUpInside];
//画笔大小按钮的功能
[lineWidthButton addTarget:self action:@selector(editSceneToLineWidthScene:) forControlEvents:UIControlEventTouchUpInside];
//-----------------------------------------------------------------------------------------------------------------------
二,画图
布局和跳转写好之后,就要完成主要功能,最主要功能是画图,界面三
建立一个画图类,.h文件如下:
@interface TuyaPad : UIView
@property (nonatomic,strong)UIColor * lineColor;
@property (nonatomic,assign)CGFloat lineWidth;
-(UIImage *)getImageFromCurrentContext;
@end
实现内容如下:
#import "TuyaPad.h"
@interface TuyaPath:NSObject
@property (nonatomic,assign)CGMutablePathRef path;
@property (nonatomic,assign)CGColorRef color;
@property (nonatomic,assign)CGFloat width;
@end
@implementation TuyaPath
@end
@interfaceTuyaPad()
//存储路径信息
@property (nonatomic,strong)NSMutableArray* pathlist;
@end
@implementation TuyaPad
{
//触摸路径
CGMutablePathRef touchPath;
//中间变量路径
CGMutablePathRef tempPath;
//三个触摸点
CGPoint startPoint,controlPoint,endPoint;
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.lineColor=[UIColor blackColor];
self.lineWidth=10.f;
self.pathlist=[[NSMutableArray alloc]init];
}
returnself;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
[super drawRect:rect];
//1,获取当前画布
CGContextRef context=UIGraphicsGetCurrentContext();
//2,划线
for (TuyaPath *path in self.pathlist) {
//设置描绘颜色
CGContextSetStrokeColorWithColor(context, path.color);
//设置线条宽度
CGContextSetLineWidth(context, path.width);
//将路径添加到画布上
CGContextAddPath(context, path.path);
//设置线条形状
CGContextSetLineCap(context, kCGLineCapRound);
//开始描绘
CGContextStrokePath(context);
}
}
//触摸开始
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
//实例化tuyaPath对象
TuyaPath *itemPath=[[TuyaPath alloc]init];
itemPath.color=self.lineColor.CGColor;
itemPath.width=self.lineWidth;
//实例化触摸路径对象
touchPath=CGPathCreateMutable();
itemPath.path=touchPath;
//将TuyaPath对象添加到路径数组内
[self.pathlist addObject:itemPath];
//获取触摸对象
UITouch *touch=[touches anyObject];
startPoint =[touch previousLocationInView:self];
controlPoint=[touch previousLocationInView:self];
endPoint=[touch locationInView:self];
[self touchesMoved:touches withEvent:event];
}
//触摸移动
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
//获取触摸对象
UITouch *touch=[touches anyObject];
startPoint=controlPoint;
controlPoint=[touch previousLocationInView:self];
endPoint=[touch locationInView:self];
CGFloat mid1x=(startPoint.x+controlPoint.x)/2.0;
CGFloat mid1y=(startPoint.y+controlPoint.y)/2.0;
CGFloat mid2x=(controlPoint.x+endPoint.x)/2.0;
CGFloat mid2y=(controlPoint.y+endPoint.y)/2.0;
tempPath=CGPathCreateMutable();
CGPathMoveToPoint(tempPath, NULL, mid1x, mid1y);
CGPathAddQuadCurveToPoint(tempPath, NULL, controlPoint.x, controlPoint.y, mid2x, mid2y);
//将中间变量路径添加到触摸路径内
CGPathAddPath(touchPath, NULL, tempPath);
//获取路径数组内的最后一个元素
TuyaPath *laseItem=[self.pathlist lastObject];
laseItem.path=touchPath;
//根据中间变量路径,计算最小范围
CGRect boundingBox=CGPathGetBoundingBox(tempPath);
boundingBox.origin.x-=self.lineWidth;
boundingBox.origin.y-=self.lineWidth;
boundingBox.size.width+=2*self.lineWidth;
boundingBox.size.height+=2*self.lineWidth;
//[self setNeedsDisplay];
[selfsetNeedsDisplayInRect:boundingBox];//在原画板上画bounding区域的内容
}
//触摸结束
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
//获取触摸路径对象
TuyaPath *lastPath=[self.pathlist lastObject];
//指定触摸路径对象结束时,触摸路径是touchPath
lastPath.path=touchPath;
}
-(UIImage *)getImageFromCurrentContext
{
UIGraphicsBeginImageContext(self.bounds.size);//创建画布用UIGraphicsGetCurrentContext()可以获得
[self.layerrenderInContext:UIGraphicsGetCurrentContext()];//self.layer当前画布上的内容 渲染到图片画布
UIImage *result= UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[self.pathlistremoveAllObjects];
[selfsetNeedsDisplay];
return result;
}
@end
主要内容如上,剩下的是细节和部分功能,在下节上主要代码.
