If you Apple-D on the DrawString method to decompile it, you'll see
it's ios7 only
[Since (7, 0), CompilerGenerated]
public static void DrawString (this NSString This, PointF point,
UIStringAttributes attributes)
{
This.WeakDrawString (point, attributes.Dictionary);
}
I suspect it's calling
}
Messaging.void_objc_msgSend_PointF_IntPtr (This.Handle,
Selector.GetHandle ("drawAtPoint:withAttributes:"), point,
attributes.Handle);
}
Which is iOS7 only:
https://developer.apple.com/library/ios/documentation/uikit/reference/NSString_UIKit_Additions/Reference/Reference.html#//apple_ref/occ/instm/NSString/drawAtPoint:withAttributes:
Availability
Available in iOS 7.0 and later.
On Tue, Feb 11, 2014 at 9:13 AM, Guido Van Hoecke <gui...@gmail.com> wrote:
> Guido Van Hoecke <gui...@gmail.com> writes:
>
>> Guido Van Hoecke <gui...@gmail.com> writes:
>>
>>> Guido Van Hoecke <gui...@gmail.com> writes:
>>>
>>>> Following method crashes on iPad.
>>>
>>> The problem might be related to the size of the font. The same code
>>> works fine on iphone, but of course uses a smaller fint there. (The game
>>> draws a character in an 8x8 grid, which means cell size and thus font
>>> size is much smaller on iphone)
>>
>> The ipad runs ois 5.1.1, the iphone runs 7.0.4
>>
>> This may also be important in pinpointing the bug.
>
> I filed a bug report at
> https://bugzilla.xamarin.com/show_bug.cgi?id=17691
>
> Guido
>
>>
>> Guido
>>
>>>>
>>>> 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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--
Nic Wise
t. +64 21 676 418 | @fastchicken
b. http://www.fastchicken.co.nz/
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