iphone - resignFirstResponder 有后续处理问题(键盘关闭受阻或在 iPhone 5 上崩溃)

Question

我有以下工作流程:

Input in Textfield -> (Return key of TextField pressed: resignFirstResponder, IBAction of Button called) -> IBAction of Button: perform an intensive operation

问题是在使用 resignFirstResponder 关闭键盘之前开始密集操作。正如其他帖子所建议的那样(例如 https://stackoverflow.com/a/3452767/1685971 )，我尝试使用:

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    [self performSelector:@selector(ibActionMethod:) withObject:sender afterDelay:someTime];
    return YES;
}

这在模拟器或 iPhone 4 上运行良好，但会导致在 iPhone 5 上运行时崩溃(我无法理解，因为我没有使用 performSelectorInBackground:withObject:):

void _WebThreadLockFromAnyThread(bool): Obtaining the web lock from a thread other than the main thread or the web thread. UIKit should not be called from a secondary thread.
bool _WebTryThreadLock(bool): Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now...

我尝试的另一个选择是在主线程中等待 resignFirstResponder

[textField performSelectorOnMainThread:@selector(resignFirstResponder) withObject:nil waitUntilDone:YES];

但是键盘仍然没有立即消失(可能是因为该方法只等待选择器 resignFirstResponder 的返回，而不是键盘动画的完成。

有什么解决办法吗？

Answer 1

试试这个

dispatch_async(dispatch_get_main_queue(), ^{
    // your button action
});

我也遇到了同样的错误，通过上面的技巧解决了。