如何不允许用户在 uitextfield 中输入大于 190 的值? [英] How to not allow the user to enter a value more than 190 in uitextfield?
本文介绍了如何不允许用户在 uitextfield 中输入大于 190 的值?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我必须在输入自身时允许 uitextfield
中小于 190 的值.我们不应该允许用户在输入 1
到 9
数字之后19
.
I have to allow values less than 190 in uitextfield
while entering itself.we should not allow user to enter 1
to 9
digits after 19
.
任何人都可以向我提供有关此的一些信息.我尝试了下面的代码.但它允许超过 190
.
Can anyone please provide me some info regarding this.
I tried the below code.But it's allowing more than 190
.
if countElements(textField.text!) + countElements(string) - range.length < 4
{
var floatValue : Float = NSString(string: toString(textField.text)).floatValue
return floatValue < 190.0
}
推荐答案
我将如何将包含 uitextfield 的 uiviewcontroller 设置为文本字段的委托.然后添加:
How i would do it is set the the uiviewcontroller containing the uitextfield as the delegate of the text field. Then add this:
//If number of characters needs to be less than 190
- (BOOL)textField:(UITextField *)textField
shouldChangeCharactersInRange:(NSRange)range
replacementString:(NSString *)string
{
NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
if([newString length]>190){
return NO;
}
return YES;
}
//If value needs to be less than 190
- (BOOL)textField:(UITextField *)textField
shouldChangeCharactersInRange:(NSRange)range
replacementString:(NSString *)string
{
NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
if([newString intValue]>190){
return NO;
}
return YES;
}
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