iOS中TextField限制小数点

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<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);"></span><pre name="code" class="objc">- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if ([string isEqualToString:@"\n"])
{
return YES;
}
if([textField.text rangeOfString:@"."].length){
if ([string isEqualToString:@"."]) {
return NO;
}
}
if ([string isEqualToString:@"."]) {
if (!textField.text.length) {
return  NO;
}
}
NSString * toBeString = [textField.text stringByReplacingCharactersInRange:range withString:string];
NSRange rangeA = [toBeString rangeOfString:@"."];
if (rangeA.length) {
NSArray * stringArr = [toBeString componentsSeparatedByString:@"."];
if ([stringArr[1] length] >=3) {
return NO;
}
}
return YES;
}

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<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">以上是代码，首先需要遵守协议，且textfield的代理是当前视图控制器</span>