UITextField中文输入法输入时对字符长度的限制 输入时对字符类型的限制

NSString * regex = @"^[A-Za-z0-9]{9,15}$";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
BOOL isMatch = [pred evaluateWithObject:txtfldPhoneNumber.text];

如果只限制让输入中文和英文的话，可以这样设置：
NSString *regex = @"[a-zA-Z\u4e00-\u9fa5][a-zA-Z\u4e00-\u9fa5]+";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];

if(![pred evaluateWithObject: _textField.text])
{
//此动画为弹出
UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"提示" message:@"昵称只能由中文、字母组成" delegate:self cancelButtonTitle:@"确定" otherButtonTitles: nil];
[alertView show];
return;
}else
{
//代理方法的实现
[self.delegate sendName:_textField.text];
[self.navigationController popViewControllerAnimated:YES];
}
如果要单个限制的话，可以宏定义：
#define NUMBERS     @"0123456789\n"
#define kAlphaNum   @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
#define kAlpha      @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
#define kNumber     @"0123456789"
#define kHans       @"zh-Hans"
#define HNMUBERS     @"0123456789./*-+~!@#$%^&()_+-=,./;'[]{}:<>?`"
然后在-(BOOL)textField:(UITextField *)textField
shouldChangeCharactersInRange:(NSRange)range
replacementString:(NSString *)string 方法里面进行限制的操作：
NSCharacterSet *cs;

cs = [[NSCharacterSet characterSetWithCharactersInString:HNMUBERS]invertedSet];

NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs]componentsJoinedByString:@""]; //按cs分离出数组,数组按@""分离出字符串

BOOL canChange = [string isEqualToString:filtered];

if(canChange) {

[WYTools showTextOnlyHud:@"请输入英文或中文" delay:1.0];
return NO;
}

return YES;
替换不同的宏定义就可以了！