[英]How to let drawRect get the value of points from ViewController and draw?
我从UIView创建了一个newView类,旨在绘制一个四边形。 四边形的四个角(ClipPointA,ClipPointB,ClipPointC,ClipPointD)应该从ViewController读取值。
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
我在ViewController中创建了newView实例。 如何编写下一部分代码,以使4个CGPoint从ViewController读取值?
谢谢。
当您创建新的UIView时,请同时传递点数,例如:让A,B,C,D为您的4点
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];
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