Following method crashes on iPad.
private void DrawChar (CGContext g, RectangleF frame, string c, StateType
state)
{
var h = Convert.ToInt32 (frame.Height * .8);
var s = new NSString (c);
var size = MCiOS.TextSize (UIFont.BoldSystemFontOfSize (h), c.ToString
());
var p = new PointF (frame.X + (frame.Width - size.Width) / 2, frame.Y +
(frame.Height - size.Height) / 2);
var font = UIFont.BoldSystemFontOfSize(h);
Debug.Assert(font != null, "Failed to get font of size " + h);
s.DrawString (p, new UIStringAttributes {
Font = font,
ForegroundColor = _textColors [(int)state],
});
}
The 'Font = font' line is painted green.
Initially I did not use the intermediate variable but changed the code
so that I could check on the font being null. Turns out it isn't: I get
{Helvetica-Bold 56}.
The details of the exception seem to indicate that it really crashes
inside MonoTouch:
System.ArgumentNullException: Argument cannot be null.
Parameter name: key
at MonoTouch.Foundation.DictionaryContainer.SetNativeValue
(MonoTouch.Foundation.NSString key, INativeObject value, Boolean
removeNullValue) [0x0002f] in
/Developer/MonoTouch/Source/maccore/src/Foundation/.pmcs-compat.DictionaryContainer.cs:343
at MonoTouch.UIKit.UIStringAttributes.set_Font (MonoTouch.UIKit.UIFont value)
[0x00000] in
/Developer/MonoTouch/Source/monotouch/src/UIKit/.pmcs-compat.UIStringAttributes.cs:78
at XOOX.Classes.PuzzleView.DrawChar (MonoTouch.CoreGraphics.CGContext g,
RectangleF frame, System.String c, StateType state) [0x000ad] in
/Users/guivho/Mono/XOOX/XOOX/Classes/PuzzleView.cs:332
at XOOX.Classes.PuzzleView.DrawCell (RectangleF frame, System.String c,
TrailType trail, StateType state, System.Collections.Generic.List`1 dots)
[0x00066] in /Users/guivho/Mono/XOOX/XOOX/Classes/PuzzleView.cs:294
at XOOX.Classes.PuzzleView.DrawPuzzle () [0x00163] in
/Users/guivho/Mono/XOOX/XOOX/Classes/PuzzleView.cs:163
at XOOX.Classes.PuzzleView.Draw (RectangleF rect) [0x00002] in
/Users/guivho/Mono/XOOX/XOOX/Classes/PuzzleView.cs:112
at at (wrapper managed-to-native)
MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String
principalClassName, System.String delegateClassName) [0x0004c] in
/Developer/MonoTouch/Source/monotouch/src/UIKit/.pmcs-compat.UIApplication.cs:38
at XOOX.Application.Main (System.String[] args) [0x00008] in
/Users/guivho/Mono/XOOX/XOOX/Main.cs:15
Is there some way I can prevent this error from happening?
Guido
--
The way I understand it, the Russians are sort of a combination of evil and
incompetence... sort of like the Post Office with tanks.
-- Emo Philips
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