[英]Programmatically focus on UITextView that is created as an AccessoryView
在我的iOS應用中,我創建一個UIAlert並向其中動態添加一個UITextView:
UIAlertView *tweetAlert = [[UIAlertView alloc] initWithTitle:@"Compose Tweet"
message:nil
delegate:self
cancelButtonTitle:@"Cancel"
otherButtonTitles:nil];
tweetTextView = [UITextView new];
[tweetTextView setText:[NSString stringWithFormat:@"%@ %@", [[NSUserDefaults standardUserDefaults] valueForKey:@"tweetText"], self.setShareURL]];
[tweetAlert setValue:tweetTextView forKey:@"accessoryView"];
[tweetAlert addButtonWithTitle:@"Tweet"];
[tweetAlert show];
[tweetTextView becomeFirstResponder]; // focus textview and open keyboard
我試圖將重點放在最后一行的UITextView上,以便在出現UIAlertView時打開鍵盤。 但是,沒有出現鍵盤,並且UITextView不在焦點上。
我也試過
[[tweetAlert valueForKey:@"accessoryView"] becomeFirstResponder];
但是我得到了錯誤
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIAlertView 0x1358b3200> valueForUndefinedKey:]: this class is not key value coding-compliant for the key accessoryView.'
任何想法如何專注於動態創建的UITextView,該UITextView作為附件視圖嵌入在UIAlertView中?
通常不建議您修改警報視圖的視圖層次結構。 您應該只使用文本輸入UIAlertView:
UIAlertView *tweetAlert = [[UIAlertView alloc] initWithTitle:@"Compose Tweet"
message:nil
delegate:self
cancelButtonTitle:@"Cancel"
otherButtonTitles:nil];
tweetAlert.alertViewStyle = UIAlertViewStylePlainTextInput;
您可以使用UIAlertViewDelegate
方法- (void)didPresentAlertView:(UIAlertView *)alertView
使textview成為第一響應者。
- (void)didPresentAlertView:(UIAlertView *)alertView {
[tweetTextView becomeFirstResponder];
}
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