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我一直在盯着過去一週的這個問題。無數杯喬，踩着我的鍵盤的貓，還有女朋友想讓我晚點離開筆記本電腦 - 我仍然無法弄清楚這一點。希望我正在做一些非常愚蠢的事情（100％機率），我總是在尋找。我在將數字加到我的數字鍵盤上時缺少什麼？
我有一些代碼附加到數字鍵盤的小數。大部分代碼是從這裏取得的（http://brygruver.squarespace.com/blog/2009/10/1/creating-a-custom-number-pad.html?lastPage=true&postSubmitted=true），我使用他的代碼，但修改了一下，只將小數點和圖像附加到我總共五個字段的最後兩個字段。
這裏是我的代碼，與表示十進制圖像，並將其追加到輸入：
- (void)textFieldDidBeginEditing:(UITextField *)textField {
// We need to access the dot Button declared in the Delegate.
helloAppDelegate *appDelegate = (helloAppDelegate *)[[UIApplication sharedApplication] delegate];
// Only if we are editing within the Number Pad Text Field do we want the dot.
if (textField == txtUserName4) {
// Show the Dot.
appDelegate.dot.hidden = NO;
}
else if (textField == txtUserName5) {
// Show the Dot.
appDelegate.dot.hidden = NO;
}
else {
// Otherwise, Hide the Dot.
appDelegate.dot.hidden = YES;
}
}
- (void)addDecimal:(NSNotification *)notification {
// Apend the Decimal to the TextField.
if (txtUserName4.editing) {
txtUserName4.text = [txtUserName4.text stringByAppendingString:@"."];
}
else if (txtUserName5.editing) {
txtUserName5.text = [txtUserName5.text stringByAppendingString:@"."];
}
這裏是發生了什麼（http://screencast.com/t/OTNhODRiYjAt）的視頻。小數點不顯示，除非我出現警報錯誤，然後它顯示正確的兩個字段。因此，我關閉了字段驗證和 - 令人震驚的 - 最後兩個字段（http://screencast.com/t/ZmQyOTc1MT）上的小數顯示。所以它不能是顯示小數的代碼，而是我有的驗證。
這裏是我的驗證。我在想我的文本域是零還是第一響應者？
- (void)textFieldDidEndEditing:(UITextField *)textField
{
if (textField == txtUserName)
{
NSString *userNameOne = txtUserName.text;
double numOne = [userNameOne doubleValue];
if(numOne < 30 || numOne > 80)
{
//show alert
//release alert
//if there is alert then clear out the field and make that the FR
[txtUserName becomeFirstResponder];
txtUserName.text = nil;
}
else
{
[txtUserName2 becomeFirstResponder];
}
}
else if (textField == txtUserName2)
{
NSString *userNameThree = txtUserName2.text;
float numTwo = [userNameThree doubleValue];
if (numTwo < 20 || numTwo > 32)
{
//show alert
//release alert
//if there is alert then clear out the field and make that the FR
[txtUserName2 becomeFirstResponder];
txtUserName2.text = nil;
}
else
{
[txtUserName3 becomeFirstResponder];
}
}
else if (textField == txtUserName3)
{
NSString *userNameThree = txtUserName3.text;
float numThree = [userNameThree doubleValue];
if (numThree < 475 || numThree > 650)
{
//show alert
//release alert
//if there is alert then clear out the field and make that the FR
[txtUserName3 becomeFirstResponder];
txtUserName3.text = nil;
}
else
{
[txtUserName4 becomeFirstResponder];
}
}
else if (textField == txtUserName4)
{
NSString *userNameFour = txtUserName4.text;
double numFour = [userNameFour doubleValue];
if (numFour < 0.5 || numFour > 3.00)
{
//show alert
//release alert
//if there is alert then clear out the field and make that the FR
[txtUserName4 becomeFirstResponder];
txtUserName4.text = nil;
}
else
{
[txtUserName5 becomeFirstResponder];
}
}
else if (textField == txtUserName5)
{
NSString *userNameFive = txtUserName5.text;
double numFive = [userNameFive doubleValue];
if (numFive > 0.80)
{
//show alert
//release alert
//if there is alert then clear out the field and make that the FR
[txtUserName5 becomeFirstResponder];
txtUserName5.text = nil;
}
else
{
[txtUserName5 resignFirstResponder];
}
}
}
我真的很爲難，但至少想通了，這件事情與我的驗證的東西混合起來......
編輯： 我發現，如果我註釋掉else，使下一個場第一響應者，那麼所有事情都應該如此。
這樣說，刪除else真的會傷害我的任何驗證？整個驗證是在我使用基本鍵盤時使用'done'和'next'按鈕的想法。現在，我看到我的整個驗證代碼缺乏:)