UIAlertView已經被棄用，iOS 8開始由UIAlertController取代它囉！如此變得更親切迷人～
過去能透過UIAlertView做出可填寫欄位UITextField，現在UIAlertController也能實現，而且更加方便好操作。
例如上圖程式碼這麼寫：
/**
Theme: UIAlertController
IDE: Xcode 7
Language: Objective C
Date: 105/03/30
Author: HappyMan
Blog: https://cg2010studio.wordpress.com/
*/
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"修改暱稱"
message:@""
preferredStyle:UIAlertControllerStyleAlert];
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
// optionally configure the text field
textField.keyboardType = UIKeyboardTypeDefault;
}];
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"送出"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action) {
UITextField *textField = [alert.textFields firstObject];
}];
[alert addAction:okAction];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}];
[alert addAction:cancelAction];
[self presentViewController:alert animated:YES completion:nil];
看要增加幾個選項按鈕都可以，而且都是用Block來做後續處理，不用再像過去還要跳來跳去的Delegate。
逍遙文工作室 
隨意留個言吧：）～