如何在iOS中填充文本字段后发送服务调用
如何在iOS中填充文本字段后发送服务调用
提问于 2016-10-26 21:09:11
我想发送服务调用来了解pin是否正确。我有4个文本字段。如果输入第4个文本字段，则服务呼叫必须自动转出。这意味着所有的文本字段都应该填充。服务调用必须以这样的方式进行:如果用户更改了1、2、3或4，我们就必须用textField:shouldChangeCharactersInRange编写。但我不知道该在哪里写。
请帮帮我。下面是我的代码：
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSCharacterSet *acceptedInput = [NSCharacterSet characterSetWithCharactersInString:ACCEPTABLE_CHARECTERS];
if (textField == self.textFied1&&([[string componentsSeparatedByCharactersInSet:acceptedInput] count] > 0))
{
int length = (int)[textField.text length];
if (length==1)
{
[self.textField2 becomeFirstResponder];
if(range.length == 0)
{
[self.textField2 becomeFirstResponder];
return NO;
}
if([self.textFied1.text length]==1)
{
self.textFied1.text=@"";
[self.textFied1 becomeFirstResponder];
return NO;
}
}
if (([[self.textField4 text] length] > 0)&& ([[self.textField2 text] length] > 0)&& ([[self.textField3 text] length] > 0)&& ([[self.textFied1 text] length] > 0)){
[self connected1];//this step is not executing
}
}
else if (textField == self.textField2&&([[string componentsSeparatedByCharactersInSet:acceptedInput] count] > 0))
{
int length = (int)[textField.text length];
if (length==1)
{
if(range.length == 0)
{
[self.textField3 becomeFirstResponder];
return NO;
}
if([self.textField2.text length]==1)
{
self.textField2.text=@"";
[self.textFied1 becomeFirstResponder];
return NO;
}
}
if (([[self.textField4 text] length] > 0)&& ([[self.textFied1 text] length] > 0)&& ([[self.textField3 text] length] > 0)&&([[self.textField2 text] length] > 0)){
[self connected1];//this step is not executing
}
}
else if (textField == self.textField3&&([[string componentsSeparatedByCharactersInSet:acceptedInput] count] > 0))
{
int length = (int)[self.textField3.text length];
if (length==1)
{
if(range.length == 0)
{
[self.textField4 becomeFirstResponder];
return NO;
}
if([self.textField3.text length]==1)
{
self.textField3.text=@"";
[self.textField2 becomeFirstResponder];
return NO;
}
}
if (([[self.textField4 text] length] > 0)&& ([[self.textField2 text] length] > 0)&& ([[self.textFied1 text] length] > 0)&& ([[self.textField3 text] length] > 0)){
[self connected1];//this step is not executing
}
}
else if (textField == self.textField4&&([[string componentsSeparatedByCharactersInSet:acceptedInput] count] > 0))
{
int length = (int)[textField.text length];
if (length==1)
{
if(range.length == 0)
return NO;
if([self.textField4.text length]==1)
{
self.textField4.text=@"";
[self.textField3 becomeFirstResponder];
return NO;
}
}
// here my service code
if (([[self.textFied1 text] length] > 0)&& ([[self.textField2 text] length] > 0)&& ([[self.textField3 text] length] > 0)&&([[self.textField4 text] length] > 0))
{
[self connected1];//this step is not executing
}
}
return YES;
}Stack Overflow用户
发布于 2016-10-27 01:00:32
这是因为在- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string中你不能直接获取字符串。
首先，将用户的输入文本设置为：
NSString *content = [textField.text stringByAppendingString:string];然后用content匹配每个条件。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/40263197
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