UIActionSheet中的键盘没有输入任何内容 [英] keyboard in UIActionSheet does not type anything
问题描述
我想知道为什么我的UITextField打开的iPhone键盘除了文本字段本身内的删除键和清除按钮之外没有输入任何内容。文本字段嵌入在UIActionSheet中，其中包含以下代码示例：
I'm wondering why my iPhone keyboard opened by a UITextField doesn't type anything except the delete key and the clear button within the text field itself. The text field is embedded in a UIActionSheet with this code sample:
// setup UITextField for the UIActionSheet
UITextField* textField = [[UITextField alloc] initWithFrame:CGRectMake(8.0, 34.0, 304.0, 30.0)];
NSString* startText = [[self.pathName lastPathComponent] stringByDeletingPathExtension];
textField.borderStyle = UITextBorderStyleRoundedRect;
textField.backgroundColor = [UIColor whiteColor];
textField.clearButtonMode = UITextFieldViewModeAlways;
textField.text = startText;
textField.delegate = self;
[textField setKeyboardType:UIKeyboardTypeAlphabet];
[textField setKeyboardAppearance:UIKeyboardAppearanceAlert];
// setup UIActionSheet
UIActionSheet* asheet = [[UIActionSheet alloc] initWithTitle: @"Please enter file name\n\n\n"
delegate: self
cancelButtonTitle: @"Cancel"
destructiveButtonTitle: nil
otherButtonTitles: @"OK", nil];
if ([currentView isKindOfClass:[UIToolbar class]])
[asheet showFromToolbar:(UIToolbar*)currentView];
else if ([currentView isKindOfClass:[UITabBar class]])
[asheet showFromTabBar:(UITabBar*)currentView];
else
[asheet showInView:currentView];
[asheet setFrame:CGRectMake(0.0, 60.0, 320.0, 380.0)];
[asheet insertSubview:textField atIndex:0];
[textField becomeFirstResponder];
// memory management
[textField release];
[asheet release];
我可以按Shift键但键不会改为小写，它们总是大写的。好吧，我从未使用过带有操作表的文本字段......我在这里做错了什么？行动表和文本字段的委托方法似乎根据需要存在。
I can press the shift key but the keys don't change to lowercase, they are always uppercase. Well, I have never used a text field with an action sheet ... what am I doing wrong here? The delegate methods for action sheet and text field seem to be present as needed.
修改：
我已更改了操作表的视图关联以及操作表的大小：
I've changed the view association of the action sheet and the size of the action sheet as well:
UIWindow* appWindow = [UIApplication sharedApplication].keyWindow;
[asheet showInView:appWindow];
[asheet setFrame:CGRectMake(0.0, 60.0, 320.0, 204.0)];
while (CGRectEqualToRect(asheet.bounds, CGRectZero))
;
// Add the text field to action sheet
[asheet addSubview:textField];
[textField release];
现在，操作表显示键盘没有重叠（或欠重叠），操作表显示正确位于状态栏和导航栏下方，键盘位于操作表下方，自下而上。
Now the keyboard is not overlapped (or "underlapped") by the action sheet, the action sheet shows properly below status bar and navigation bar and the keyboard follows below the action sheet and comes from bottom up.
但只有 textFieldShouldBeginEditing 和 textFieldDidBeginEditing 调用文本字段的委托方法，仅此而已。当我点击它时，Shift键改变，擦除键工作，所有其他键显示自己 - 但不插入文本字段。那么，它的全部意义何在？
But only textFieldShouldBeginEditing and textFieldDidBeginEditing get called of the text field's delegate methods, nothing more. The shift key changes when I tap it, the erase key works, all other keys show themselves on tap - but don't insert into the text field. So, what is it all about?
解决方案：
感谢SVD指出我似乎无法将UITextField嵌入到一张UIActionSheet。因为我想要一个方法来返回带有操作表的文件名字符串（因为我喜欢外观而不是添加了文本字段的UIAlertView）我已经花了更多的工作，最后找到了一个有效的解决方案。我在这里分享是因为我意识到你们中有很多人在寻找类似的东西。
Solution: Thanks to SVD pointing me to the fact that it doesn't seem to be possible to embed a UITextField into a UIActionSheet. Because I want to have a method that returns a file name string with an action sheet (just because I like the appearance more than a UIAlertView with a text field added) I've spent some more work on it and finally found a working solution. I share it here because I realized that quite a lot of you were looking for a similar thing.
要使这项工作有两个主要方面需要考虑：
There are two main aspects to consider to get this working:
-
文本字段不能是操作表的子视图，至少在处于可编辑状态的
时刻
the text field must not be a subview of the action sheet, at least at the moment when it is in editable state
操作表不应与键盘重叠
好的，这里是代码。模态解决方案适用于第二个runloop，因此可以处理文本字段和操作表的委托方法，无需返回调用者 - 我确信这可以分解为传统方法，您可以在其中处理所有委托内容你自己的班级。
Ok, here comes the code. The modal solution works with a second runloop, so the delegate methods for text field and action sheet can be handled w/out returning to the caller - I'm sure this can be broken down into the conventional approach where you handle all delegate stuff within your own class.
ModalAction.h：
ModalAction.h:
#import <UIKit/UIKit.h>
@interface ModalAction : NSObject
+ (NSString*)ask: (NSString*)question
withTextPrompt: (NSString*)prompt
textPreset: (NSString*)preset
dockToView: (UIView*)toView;
@end
ModalAction.m：
ModalAction.m:
#import "ModalAction.h"
#define TEXT_FIELD_TAG 9999
#define ACTION_SHEET_TAG 8888
@interface ModalActionDelegate : NSObject <UIActionSheetDelegate, UITextFieldDelegate>
{
CFRunLoopRef currentLoop;
NSString* text;
NSUInteger index;
}
@property (assign) NSUInteger index;
@property (retain) NSString* text;
@end
@implementation ModalActionDelegate
@synthesize index;
@synthesize text;
-(id)initWithRunLoop: (CFRunLoopRef)runLoop
{
if (self = [super init])
currentLoop = runLoop;
return self;
}
// Activate keyboard
- (void)acceptInput: (UIActionSheet*)actionSheet
{
UITextField* textField = (UITextField*)[actionSheet viewWithTag:TEXT_FIELD_TAG];
UIWindow* appWindow = [UIApplication sharedApplication].keyWindow;
CGRect frame = textField.frame;
[appWindow insertSubview:textField aboveSubview:actionSheet];
frame.origin.y += 60.0; // move text field to same position as on action sheet
textField.frame = frame;
[textField becomeFirstResponder];
}
- (void)dealloc
{
self.text = nil;
[super dealloc];
}
#pragma mark -
#pragma mark === UIActionSheetDelegate ===
#pragma mark -
// User pressed button. Retrieve results
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSLog(@"actionSheet clickedButtonAtIndex:%d", buttonIndex);
UIWindow* appWindow = [UIApplication sharedApplication].keyWindow;
UITextField* textField = (UITextField*)[appWindow viewWithTag:TEXT_FIELD_TAG];
if (textField != nil)
self.text = textField.text;
self.index = buttonIndex;
CFRunLoopStop(currentLoop);
}
#pragma mark -
#pragma mark === UITextFieldDelegate ===
#pragma mark -
- (BOOL)textFieldShouldBeginEditing:(UITextField*)textField
{
NSLog(@"textFieldShouldBeginEditing");
return YES;
}
- (void)textFieldDidBeginEditing:(UITextField*)textField
{
NSLog(@"textFieldDidBeginEditing");
[textField becomeFirstResponder];
}
- (BOOL)textFieldShouldEndEditing:(UITextField*)textField
{
NSLog(@"textFieldShouldEndEditing");
return YES;
}
- (void)textFieldDidEndEditing:(UITextField*)textField
{
NSLog(@"textFieldDidEndEditing");
[textField resignFirstResponder];
}
- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string
{
return YES;
}
- (BOOL)textFieldShouldClear:(UITextField*)textField
{
NSLog(@"textFieldShouldClearEditing");
return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField*)textField
{
NSLog(@"textFieldShouldReturn (%@)", textField.text);
BOOL hasSomeText = ![textField.text isEqualToString:@""];
if (hasSomeText)
{
// send an OK to the action sheet
UIWindow* appWindow = [UIApplication sharedApplication].keyWindow;
UIActionSheet* actionSheet = (UIActionSheet*)[appWindow viewWithTag:ACTION_SHEET_TAG];
if (actionSheet != nil)
{
[actionSheet dismissWithClickedButtonIndex:0 animated:YES];
self.text = textField.text;
self.index = 0;
CFRunLoopStop(currentLoop);
[textField resignFirstResponder];
}
}
return hasSomeText;
}
@end
@implementation ModalAction
+ (NSString*)textQueryWith: (NSString*)question
prompt: (NSString*)prompt
textPreset: (NSString*)preset
button1: (NSString*)button1
button2: (NSString*)button2
forView: (UIView*)toView
{
// Create action sheet
CFRunLoopRef currentLoop = CFRunLoopGetCurrent();
ModalActionDelegate* madelegate = [[ModalActionDelegate alloc] initWithRunLoop:currentLoop];
NSString* sheetTitle = [question stringByAppendingString:@"\n\n\n"];
UIActionSheet* actionSheet = [[UIActionSheet alloc] initWithTitle: sheetTitle
delegate: madelegate
cancelButtonTitle: button1
destructiveButtonTitle: nil
otherButtonTitles: button2, nil];
actionSheet.tag = ACTION_SHEET_TAG;
// Build text field
UITextField* textField = [[UITextField alloc] initWithFrame:CGRectMake(8.0, 34.0, 304.0, 30.0)];
textField.borderStyle = UITextBorderStyleRoundedRect;
textField.tag = TEXT_FIELD_TAG;
textField.placeholder = prompt;
textField.text = preset;
textField.delegate = madelegate;
textField.clearButtonMode = UITextFieldViewModeWhileEditing;
textField.keyboardType = UIKeyboardTypeAlphabet;
textField.keyboardAppearance = UIKeyboardAppearanceAlert;
textField.autocapitalizationType = UITextAutocapitalizationTypeWords;
textField.autocorrectionType = UITextAutocorrectionTypeNo;
textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
textField.returnKeyType = UIReturnKeyDone;
// Show action sheet and wait for it to finish displaying
UIWindow* appWindow = [UIApplication sharedApplication].keyWindow;
[actionSheet showInView:appWindow];
[actionSheet setFrame:CGRectMake(0.0, 60.0, 320.0, 204.0)];
while (CGRectEqualToRect(actionSheet.bounds, CGRectZero))
;
// Add the text field to action sheet
[actionSheet addSubview:textField];
[textField release];
// Set the field to first responder and move it into place
[madelegate performSelector: @selector(acceptInput:) withObject: actionSheet];
// Start the run loop
CFRunLoopRun();
// Retrieve the user choices
NSUInteger index = madelegate.index;
NSString* answer = [[madelegate.text copy] autorelease];
if (index == 1)
answer = nil; // assumes cancel in position 1
[textField resignFirstResponder];
[actionSheet release];
textField.delegate = nil;
[textField removeFromSuperview];
[madelegate release];
return answer;
}
+ (NSString*)ask: (NSString*)question
withTextPrompt: (NSString*)prompt
textPreset: (NSString*)preset
dockToView: (UIView*)toView
{
return [ModalAction textQueryWith: question
prompt: prompt
textPreset: preset
button1: NSLocalizedString(@"AlertBtnCancel", @"")
button2: @"OK"
forView: toView];
}
@end
它在模拟器iOS上运行4.2和真实设备的iOS 4.0.2 - 我希望它对其他人也有帮助。
It is running on Simulator iOS 4.2 and on real devices' iOS 4.0.2 - I hope it is also helpful for others.
推荐答案
关于行动的一个奇怪的事情例如，如果存在标签栏，标签栏可能会窃取某些操作表单击，即使可视化操作表位于顶部。
One weird thing about action sheets is that, for example, if there's a tab bar present, the tab bar may "steal" some of the action sheets taps, even though visually the action sheet is on top.
您的操作表高度为380像素 - 因此当键盘滑出时，它会与操作表重叠。也许在这种情况下，是操作表窃取键盘的水龙头？尝试使操作表更小，更靠近顶部 - 例如为了测试这个想法我只是让它起源于0,0和240像素高。
Your action sheet is 380 pixels high - so when the keyboard slides out it overlaps with the action sheet. Perhaps in this case it is the action sheet stealing the keyboard's taps? Try making the action sheet smaller and closer to the top - e.g. to test the idea I'd just make it originate at 0,0, and 240 pixels high.
编辑：
显然这是一个问题 - 它对我来说不适用于简单的测试应用程序，没有标签栏或工具栏。我发现了这些链接：
Apparently it is a problem - it doesn't work for me either in a simple test application, without tab bar or tool bar. I've found these links though:
使用警报视图执行此操作似乎有效（尽管它似乎只适用于警报视图）：
http://discussions.info.apple .com / thread.jspa?threadID = 1674641& start = 0& tstart = 0
Doing this with an alert view and it seems to work (although it seems like it only works for alert views): http://discussions.info.apple.com/thread.jspa?threadID=1674641&start=0&tstart=0
这里有人制作了自己的行动单：
如何在UITextField中启用文本输入在UIActionSheet中？
And here someone making their own "action sheet" instead: how to enable text input in UITextField which is in UIActionSheet?
这篇关于UIActionSheet中的键盘没有输入任何内容的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
