[英]iOS UITextField resignFirstResponder on viewWillDisappear
我有兩個簡單屏幕的應用程序。 第一個屏幕始終打開第二個屏幕的相同實例。 第二個屏幕有一個text field
和一個手動隱藏keyboard
的button
。
viewWillDisappear
上的resignFirstResponder
無法正常工作。
情況1:
案例2:
碼:
@implementation MainViewController
-(void) viewDidLoad {
[super viewDidLoad];
UIStoryboard *sb = [UIStoryboardWithName:@"Main" bundle:nil];
self.searchView = (SearchViewController*) [sb instantiateViewControllerWithIdentifier:@"searchView"];
}
- (IBAction)openSearchButtonClicked:(id)sender{
[self.navigationController pushViewController:self.searchView animated:YES];
}
@end
@implementation SearchViewController
- (void)viewWillDisappear:(BOOL)animated{
assert(self.searchTextField != nil);
[self.searchTextField resignFirstResponder];
[super viewWillDisappear:animated];
}
- (IBAction)hideKeyboardButtonClicked:(id)sender{
[self.searchTextField resignFirstResponder];
}
@end
我通過解決方法解決了這個問題。 重新打開searchView后,我檢查了textFieldDidBeginEditing的堆棧跟蹤。 不知怎的,UIKit決定在文本字段上調用becomeFirstResponder。
我的解決方案是:在視圖控制器出現之前,不允許文本字段成為第一響應者。 但是,iOS 10.2上仍會出現閃爍的白屏。
- (void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
self.allowToBecomeFirstResponser = YES;
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
return self.allowToBecomeFirstResponser ;
}
- (void)viewWillDisappear:(BOOL)animated{
self.allowToBecomeFirstResponser = NO;
[super viewWillDisappear:animated];
}
0 ??? 0x000000011d54d91c 0x0 + 4787067164,
1 DEMO 0x000000010c24d880 main + 0,
2 UIKit 0x000000010d60a227 -[UITextField _becomeFirstResponder] + 481,
3 UIKit 0x000000010d04d28d -[UIResponder becomeFirstResponder] + 324,
4 UIKit 0x000000010cf42e03 -[UIView(Hierarchy) becomeFirstResponder] + 99,
5 UIKit 0x000000010d609ad7 -[UITextField becomeFirstResponder] + 51,
6 UIKit 0x000000010cf42e3b -[UIView(Hierarchy) deferredBecomeFirstResponder] + 49,
7 UIKit 0x000000010cf43144 __45-[UIView(Hierarchy) _postMovedFromSuperview:]_block_invoke + 175,
8 UIKit 0x000000010cf43086 -[UIView(Hierarchy) _postMovedFromSuperview:] + 437,
9 UIKit 0x000000010cf4cf4b -[UIView(Internal) _addSubview:positioned:relativeTo:] + 1604,
10 UIKit 0x000000010cecf392 -[_UIParallaxDimmingView didMoveToWindow] + 123,
11 UIKit 0x000000010cf4a9a0 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 1482,
12 UIKit 0x000000010cf4a68e -[UIView(Internal) _didMoveFromWindow:toWindow:] + 696,
13 UIKit 0x000000010cf43112 __45-[UIView(Hierarchy) _postMovedFromSuperview:]_block_invoke + 125,
14 UIKit 0x000000010cf43086 -[UIView(Hierarchy) _postMovedFromSuperview:] + 437,
15 UIKit 0x000000010cf4cf4b -[UIView(Internal) _addSubview:positioned:relativeTo:] + 1604,
16 UIKit 0x000000010cecbc38 __53-[_UINavigationParallaxTransition animateTransition:]_block_invoke + 2101,
17 UIKit 0x000000010cf475ce +[UIView(Animation) performWithoutAnimation:] + 65,
18 UIKit 0x000000010cecb072 -[_UINavigationParallaxTransition animateTransition:] + 1225,
19 UIKit 0x000000010d01fe6c -[UINavigationController _startCustomTransition:] + 3038,
20 UIKit 0x000000010d02b3fe -[UINavigationController _startDeferredTransitionIfNeeded:] + 386,
21 UIKit 0x000000010d02bf47 -[UINavigationController __viewWillLayoutSubviews] + 43,
22 UIKit 0x000000010d171509 -[UILayoutContainerView layoutSubviews] + 202,
-(BOOL) textFieldShouldReturn: (UITextField *) textField
{
[textField resignFirstResponder];
return YES;
}
但是你需要將UITextFieldDelegate
添加到你的SearchViewController中-(BOOL) textFieldShouldReturn:
在那里工作。
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