触摸UISearchbar时如何修复偏移键盘
我遇到的问题是，当用户触摸到搜索栏时，键盘显示正常。 然后，当presentQR方法（见下文）被调用，然后解散，然后触摸搜索presentQR时，键盘将如屏幕截图所示的那样出现。 这是iOS7; 不知道这是否重要。
我使用下面的代码添加一个UISearchbar：
// search bar
UIView *searchBarView = [[UIView alloc] initWithFrame:CGRectMake(90.0, 0.0, 200.0, 44.0)];
searchBarView.autoresizingMask = 0;
searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 190, 40)];
searchBar.backgroundImage = [[UIImage alloc] init];
searchBar.autoresizingMask = UIViewAutoresizingFlexibleWidth;
self.navigationItem.titleView = searchBar;
searchBar.delegate = self;
[[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor],UITextAttributeTextColor,[UIColor whiteColor],UITextAttributeTextShadowColor,[NSValue valueWithUIOffset:UIOffsetMake(0, -1)],UITextAttributeTextShadowOffset, nil] forState:UIControlStateNormal];
UITextField *textfield = [[UITextField alloc] init];
searchBar.placeholder = @"City Search";
// hide magnifying glass
textfield = nil;
for (UIView* subView in searchBar.subviews) {
if ([subView isKindOfClass:[UITextField class]]) {
textfield = (UITextField*)subView;
[(UITextField*)subView setTextColor:[UIColor whiteColor]];
[(UITextField*)subView setFont:[UIFont fontWithName:@"DIN-Regular" size:18]];
textfield.leftViewMode = UITextFieldViewModeNever;
textfield.rightViewMode = UITextFieldViewModeAlways;
break;
}
}
UIButton *cancelButton;
for (id button in searchBar.subviews)
{
if ([button isKindOfClass:[UIButton class]])
{
cancelButton=(UIButton*)button;
break;
}
}
[searchBar addSubview:textfield];
[searchBarView addSubview:searchBar];
self.navigationItem.titleView = searchBarView;
-(void)presentQR {
QRReaderViewController *qr = [[QRReaderViewController alloc]initWithNibName:@"QRReaderViewController" bundle:nil];
UIButton *removeQRBtn=[UIButton buttonWithType:UIButtonTypeCustom];
removeQRBtn.frame=CGRectMake(260, 10, 60, 40);
[removeQRBtn addTarget:self action:@selector(removeQR) forControlEvents:UIControlEventTouchDown];
[removeQRBtn setImage:[UIImage imageNamed:@"qrcode.png"] forState:0];
[qr.view addSubview:removeQRBtn];
qr.view.backgroundColor = customColorGrey;
qr.modalPresentationStyle = UIModalTransitionStyleCrossDissolve;
// [self presentModalViewController:qr animated:YES];
[self presentViewController:qr animated:YES completion:nil];
}
-(void)removeQR {
// [self dismissModalViewControllerAnimated:YES];
[self dismissViewControllerAnimated:YES completion:nil];
}
第一次确保在QRReaderViewController中没有像重构窗口或类似的东西。 可能会有与UIWindow冲突的元素阻止键盘正确显示。 （例如，不平衡的方位变化。）
第二如果您没有找到任何内容，则可以尝试使用以下代码访问键盘视图并尝试重置框架。 你可以把这段代码放在keyboardWillShow方法中（需要注册通知）
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIWindow_Class/UIWindowClassReference/UIWindowClassReference.html#//apple_ref/c/data/UIKeyboardWillShowNotification
PS。 我建议只记录键盘框架，以便知道它何时更改。
Reframing键盘：找到这里：https://stackoverflow.com/a/10957843/1017340
//The UIWindow that contains the keyboard view - It some situations it will be better to actually
//You need to iterate through each window to figure out where the keyboard is, but In my applications case
//I know that the second window has the keyboard so I just reference it directly
UIWindow* tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
//Because we cant get access to the UIPeripheral throughout the SDK we will just use UIView.
//UIPeripheral is a subclass of UIView anyways
UIView* keyboard;
//Iterate though each view inside of the selected Window
for(int i = 0; i < [tempWindow.subviews count]; i++)
{
//Get a reference of the current view
keyboard = [tempWindow.subviews objectAtIndex:i];
//Assuming this is for 4.0+, In 3.0 you would use "<UIKeyboard"
if([[keyboard description] hasPrefix:@"<UIPeripheral"] == YES)
{
NSLog(@"Keyboard Frame: %@",NSStringFromCGRect(keyboard.frame));
//HERE : try reframing the keyboard
//[keyboard setFrame:CGRectMake(...)]; /*NOT TESTED NOT RECOMMENDED*/
}
}