我正在为一个应用程序编写一个html编辑器组件（在iOS 5.0中使用带有contentEditable的UIWebView），并在如何处理UIWebView第一响应者状态方面陷入困境。
[webView isFirstResponder]，[webView becomeFirstResponder]和[webView resignFirstResponder]看起来不起作用，我也不知道如何让webView成为代码或者通过代码来退出它。
如果有人知道如何解决这个问题，我会非常感激，提前致谢！
UIWebView 子类中覆盖这些方法（ content 是可编辑元素的id）： - （BOOL）resignFirstResponder {
[self setUserInteractionEnabled：NO]; [self setUserInteractionEnabled：YES];
return [super resignFirstResponder];
}
//仅适用于iOS 6+
- （void）becomeFirstResponder {
self.keyboardDisplayRequiresUserAction = NO; //在此设置或在初始化期间设置
[self stringByEvaluatingJavaScriptFromString：@document.getElementById（'content'）。focus（）];
$ b $（BOOL）isFirstResponder {
if（[[self stringByEvaluatingJavaScriptFromString：@document.activeElement.id =='content'] isEqualToString：@true ]）{
return YES;
}
else {
return NO;
isFirstResponder 只会在显示键盘后返回true（例如，它会在UIKeyboardWillShowNotification返回false）
如果这是个问题，另一种方法是检查 UIWebView 是第一个响应者，如下所示：
+（BOOL） isFirstResponder：（UIView *）v {
for（UIView * vs in v.subviews）{
if（[vs isFirstResponder] || [self isFirstResponder：vs]）{
return YES;
}
}
return NO;
}
- （BOOL）isFirstResponder {
return [[self class] isFirstResponder：self];
}
这样，返回的值就是 YES 甚至在键盘动画完成（显示或隐藏）之前/之后。
I'm making an html editor component for an app (using UIWebView with contentEditable in iOS 5.0), and got stuck at how to handle UIWebView first responder status
[webView isFirstResponder], [webView becomeFirstResponder] and [webView resignFirstResponder] don't seem to work, and i've no idea how to make the webView become or resign it by code
If anyone knows how to work this out i would be very grateful, thanks in advance!
Here is how I overwrite these methods in a UIWebView subclass (content is the id of the editable element):
-(BOOL)resignFirstResponder {
[self setUserInteractionEnabled:NO];[self setUserInteractionEnabled:YES];
return [super resignFirstResponder];
}
// only works on iOS 6+
-(void)becomeFirstResponder {
self.keyboardDisplayRequiresUserAction = NO; // set here or during initialization
[self stringByEvaluatingJavaScriptFromString:@"document.getElementById('content').focus()"];
}
-(BOOL)isFirstResponder{
if ([[self stringByEvaluatingJavaScriptFromString:@"document.activeElement.id=='content'"] isEqualToString:@"true"]) {
return YES;
}
else {
return NO;
}
}
isFirstResponder will only return true after the keyboard is shown (e.g, it will return false at UIKeyboardWillShowNotification)
In case this is an issue, another way to check if the UIWebView is the first responder is as follows:
+(BOOL)isFirstResponder:(UIView *)v{
for (UIView *vs in v.subviews) {
if ([vs isFirstResponder] || [self isFirstResponder:vs]) {
return YES;
}
}
return NO;
}
-(BOOL)isFirstResponder{
return [[self class] isFirstResponder:self];
}
This way, the returned value will be YES even before/after the keyboard animation finishes (showing or hiding).
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