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我想繪製一條連接兩點的簡單線條。我想我在我的drawLine方法中得到了正確的代碼。根本沒有線條出現，我非常確定它與我打來的視圖以及我想要繪製的視圖有關。以下代碼是我在代碼中構建下一個視圖的數據（來自Web服務的數據）。視圖被創建得很好，所有的按鈕和對象都會出現。在兩點之間劃一條線 - 如何通過UIView
我想添加行到我動態創建（下一個）視圖，不知道如何做到這一點。從我得到的錯誤（無效的上下文0x0）看來，我正在做一些不按順序的事情。嘗試顯示不存在的視圖。我怎麼能做到這一點？任何意見，將不勝感激。
我意識到傳遞視圖可能不是正確的答案。我正處於試驗和錯誤之中。
澄清：我在這裏呼籲的drawLine：
[nextView.view addSubview：未來]。
感謝，
夏嘉曦
-(void) drawView
{
CGRect rec;
CGFloat width = [UIScreen mainScreen].bounds.size.width;
CGFloat height = [UIScreen mainScreen].bounds.size.height;
UIView *next = [[UIView alloc]initWithFrame:CGRectMake(0, 0, height, width)];
next.backgroundColor = [UIColor whiteColor];
next.userInteractionEnabled = YES;
next.multipleTouchEnabled = YES;
nextView = [UIViewController alloc];
[nextView setTitle: as_objectDesc];
for (object in viewObjects)
{ // ratio based on Ipad 2 screen size conversion from the Datawindow size - alter to support other device
CGFloat objWidth = object.Width/3.83;
CGFloat objHeight = object.Height/2.78;
CGFloat objXPoint = object.positionX/3.83;
CGFloat objYPoint = object.positionY/2.78;
if ([object.Shape isEqualToString:@"text"])
{
rec = CGRectMake(objXPoint, objYPoint, objWidth, objHeight);
UILabel *myLabel = [[UILabel alloc] initWithFrame:rec];
myLabel.backgroundColor = [UIColor clearColor];
myLabel.text = object.objectTag;
myLabel.lineBreakMode = NSLineBreakByWordWrapping;
if ([object.description isEqualToString:@"Header"])
{
myLabel.font = [UIFont systemFontOfSize:20];
}
else
{
myLabel.font = [UIFont systemFontOfSize:10];
}
[next addSubview:myLabel];
}
else if ([object.Shape isEqualToString:@"line"])
{
**[self drawLine:nextView.view];**
}
else
{
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
if ([object.Shape isEqualToString:@"ellipse"])
{
UIImage * buttonImage;
if ([object.Color isEqualToString:@"255"])
{
buttonImage = [UIImage imageNamed:@"redBackground.png"];
}
else if ([object.Color isEqualToString:@"65535"])
{
buttonImage = [UIImage imageNamed:@"yellowBackground.png"];
}
else if ([object.Color isEqualToString:@"GRAY"])
{
buttonImage = [UIImage imageNamed:@"graybground.PNG"];
}
else if ([object.Color isEqualToString:@"BLACK"])
{
buttonImage = [UIImage imageNamed:@"BlackBackground.png"];
}
[myButton setBackgroundImage:buttonImage forState: UIControlStateNormal];
objWidth = objHeight;
rec = CGRectMake(objXPoint, objYPoint, objWidth, objHeight);
myButton.frame = rec;
myButton.clipsToBounds = YES;
myButton.layer.cornerRadius = objWidth/2;
}
else
{
rec = CGRectMake(objXPoint, objYPoint, objWidth, objHeight);
if ([object.Color isEqualToString:@"255"])
myButton.backgroundColor = [UIColor redColor];
else if ([object.Color isEqualToString:@"65535"])
myButton.backgroundColor = [UIColor yellowColor];
else if ([object.Color isEqualToString:@"GRAY"])
myButton.backgroundColor = [UIColor grayColor];
else if ([object.Color isEqualToString:@"BLACK"])
myButton.backgroundColor = [UIColor blackColor];
}
[[myButton layer] setBorderWidth:1.0f];
[[myButton layer] setBorderColor:[UIColor blackColor].CGColor];
myButton.enabled = YES;
myButton.accessibilityHint = object.objectTag;
myButton.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
myButton.titleLabel.textAlignment = NSTextAlignmentCenter;
myButton.titleLabel.font = [UIFont systemFontOfSize:13];
[myButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[myButton addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
myButton.frame = rec;
[myButton setTitle:object.description forState:UIControlStateNormal];
// Check if an Empty Rectangle
NSRange test =[myButton.accessibilityHint rangeOfString:@"r_"];
if (test.location == 0)
{
[next sendSubviewToBack:myButton];
[myButton setEnabled:NO];
}
[next addSubview:myButton];
}
UIPinchGestureRecognizer *twoFingerPinch = [[UIPinchGestureRecognizer alloc]
initWithTarget:self
action:@selector(twoFingerPinch:)]
;
[[nextView view] addGestureRecognizer:twoFingerPinch];
[next addSubview:activityIndicator];
[next bringSubviewToFront:activityIndicator];
}
[nextView.view addSubview:next];
[self dismissViewControllerAnimated:NO completion:nil];
[self.navigationController pushViewController:nextView animated:NO];
}
- (void)drawLine:(UIView *) view
{
CGFloat x1 = object.positionX;
CGFloat y1 = object.positionY;
CGFloat x2 = object.positionX2;
CGFloat y2 = object.positionY2;
CGContextRef context = UIGraphicsGetCurrentContext();
if ([object.Color isEqualToString:@"255"])
CGContextSetStrokeColorWithColor(context, [UIColor redColor].CGColor);
else if ([object.Color isEqualToString:@"65535"])
CGContextSetStrokeColorWithColor(context, [UIColor yellowColor].CGColor);
else if ([object.Color isEqualToString:@"GRAY"])
CGContextSetStrokeColorWithColor(context, [UIColor grayColor].CGColor);
else if ([object.Color isEqualToString:@"BLACK"])
CGContextSetStrokeColorWithColor(context, [UIColor blackColor].CGColor);
CGContextSetLineWidth(context, 3.0);
CGContextBeginPath(context);
CGContextMoveToPoint(context, x1, y1);
CGContextAddLineToPoint(context, x2, y2);
CGContextStrokePath(context);
}