4

UITextField用这样的背景图片创建了一个:

_tf = new CustomTextField(new RectangleF(0,0 200, 200));
_tf.BorderStyle = UITextBorderStyle.None;
_tf.Background = UIImage.FromFile("pathToImage");
_tf.Placeholder = "default";

以下内容在哪里CustomTextField

public class CustomTextField : UITextField
{
  public CustomTextField(RectangleF rectF) : base (rectF)
  {
  }
}

它工作正常,但文本和占位符在左侧似乎都太近了。所以,我已经开始重写以下方法,但是应用程序崩溃了。

public override RectangleF PlaceholderRect (RectangleF forBounds)
{
  return RectangleF.Inflate(forBounds, 5, 5);
}

并以同样的方式EditingRectTextRect

有任何想法吗?谢谢你。

更新

例如,我只覆盖了PlaceholderRect(将占位符移动到不同的位置)但是应用程序崩溃了,为什么?

这是日志:

Stacktrace:

at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <0x00004>
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <0x00004>
at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x00038] in /Users/****/Source/iphone-3/monotouch/UIKit/UIApplication.cs:26
at MonoTouch.UIKit.UIApplication.Main (string[]) [0x00000] in /Users/****/Source/iphone-3/monotouch/UIKit/UIApplication.cs:31
at CustomControls.Application.Main (string[]) [0x00000] in /Users/****/Projects/CustomControls/CustomControls/Main.cs:14
at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x0001d, 0x00043>

Native stacktrace:
0   CustomControls                      0x000be66f mono_handle_native_sigsegv + 343
1   CustomControls                      0x0000e43e mono_sigsegv_signal_handler + 313
2   libSystem.B.dylib                   0x9992046b _sigtramp + 43
3   ???                                 0xffffffff 0x0 + 4294967295
4   CustomControls                      0x0027b991 monotouch_x86_double_abi_stret_trampoline + 144
5   UIKit                               0x01c7c68c -[UITextField layoutSubviews] + 618
6   QuartzCore                          0x03024451 -[CALayer layoutSublayers] + 181
7   QuartzCore                          0x0302417c CALayerLayoutIfNeeded + 220
8   QuartzCore                          0x0301d37c _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 310
9   QuartzCore                          0x0301d0d0 _ZN2CA11Transaction6commitEv + 292
10  UIKit                               0x01be419f -[UIApplication _reportAppLaunchFinished] + 39
11  UIKit                               0x01be4659 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 690
12  UIKit                               0x01beedb2 -[UIApplication handleEvent:withNewEvent:] + 1533
13  UIKit                               0x01be7202 -[UIApplication sendEvent:] + 71
14  UIKit                               0x01bec732 _UIApplicationHandleEvent + 7576
15  GraphicsServices                    0x03eb7a36 PurpleEventCallback + 1550
16  CoreFoundation                      0x00df9064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
17  CoreFoundation                      0x00d596f7 __CFRunLoopDoSource1 + 215
18  CoreFoundation                      0x00d56983 __CFRunLoopRun + 979
19  CoreFoundation                      0x00d56240 CFRunLoopRunSpecific + 208
20  CoreFoundation                      0x00d56161 CFRunLoopRunInMode + 97
21  UIKit                               0x01be3fa8 -[UIApplication _run] + 636
22  UIKit                               0x01bf042e UIApplicationMain + 1160
23  ???                                 0x09f31c41 0x0 + 166927425
24  ???                                 0x09f31b7a 0x0 + 166927226
25  ???                                 0x09f3157d 0x0 + 166925693
26  ???                                 0x09f314b9 0x0 + 166925497
27  ???                                 0x09f31514 0x0 + 166925588
28  CustomControls                      0x0000e202 mono_jit_runtime_invoke + 1360
29  CustomControls                      0x001c92af mono_runtime_invoke + 137
30  CustomControls                      0x001caf6b mono_runtime_exec_main + 714
31  CustomControls                      0x001ca891 mono_runtime_run_main + 812
32  CustomControls                      0x00094fe8 mono_jit_exec + 200
33  CustomControls                      0x0027cf05 main + 3494
34  CustomControls                      0x00002ca1 _start + 208
35  CustomControls                      0x00002bd0 start + 40   

您还需要其他信息吗?我的目标与此链接(堆栈溢出参考)相同,但在Monotouch中。

提前谢谢你,问候。

4

2 回答 2

1

看起来 MonoTouch 对 bounds 参数感到窒息。您可以通过向底层选择器提供自己的映射并将基本调用的 bounds 参数替换为控件的边界来解决此问题。在典型的用例中,我没有注意到任何影响,但你的里程可能会有所不同......

[MonoTouch.Foundation.Export("editingRectForBounds:")]
public RectangleF MyEditingRect()
{
    if (iWantToOverrideTheDefaultRect)
    {
        return mySpecialRect;
    }

    return base.EditingRect(this.Bounds);
}
于 2011-05-14T21:51:58.313 回答
1

这是一个仅影响模拟器的 MonoTouch 错误 [1](它是一个 x86 ABI 错误),即代码在设备上执行时将按预期工作。

[1] http://bugzilla.xamarin.com/show_bug.cgi?id=265

于 2011-08-12T18:29:25.217 回答