如何让从的drawRect得到的ViewController点的价值和借鉴？(How to let

我创建从UIView的一类NewView的，目标是绘制一个四边形。 四边形的4个coners（ClipPointA，ClipPointB，ClipPointC，ClipPointD）都应该从读取的ViewController值。

newView.h：

@interface newView : UIView {
    CGPoint ClipPointA, ClipPointB, ClipPointC, ClipPointD; 
}
@end

newView.m：

@implementation newView

- (id)initWithFrame:(CGRect)frame {

    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code.
    }
    return self;
}

- (void)drawRect:(CGRect)rect {
    // Drawing code.
    CGContextRef context = UIGraphicsGetCurrentContext(); 
    CGContextSetRGBStrokeColor(context, 1.0, 1.0, 0.0, 1.0);    
    CGContextBeginPath(context);
    CGContextMoveToPoint(context, ClipPointA.x, ClipPointA.y); //start point
    CGContextAddLineToPoint(context, ClipPointB.x, ClipPointB.y);
    CGContextAddLineToPoint(context, ClipPointD.x, ClipPointD.y); 
    CGContextAddLineToPoint(context, ClipPointC.x, ClipPointC.y); // end path   
    CGContextClosePath(context); // close path  
    CGContextSetLineWidth(context, 2.0); 
    CGContextStrokePath(context); 
}

- (void)dealloc {
    [super dealloc];
}

@end

我的ViewController创建NewView的实例。 我怎样写代码的下一个部分，让4个CGPoints从视图控制器读取值？

谢谢。

Answer 1:

当你创建新的UIView也请通过点如：设A，B，C，D是你的4分

newView *nv =[[dragman alloc]initWithFrame:self.view.frame];
    nv.ClipPointA=A;
    nv.ClipPointB=B;
        nv.ClipPointC=C;
        nv.ClipPointD=D;
    [nv setUserInteractionEnabled:YES];
    [contentView addSubview:nv];
    [nv release];

文章来源: How to let drawRect get the value of points from ViewController and draw?