一、正则表达式
使用环境很多，但经常会在用户名和密码 判断
了解更多可以查看网址内容，比如下面这个一般都能应付了：http://www.admin10000.com/document/5944.html
例子：
NSString *regex = @"^[a-z0-9A-Zu4e00-u9fa5]+";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
NSString *str = @"舞舞舞*";
if ([predicate evaluateWithObject:str]) {
NSLog(@"match1");
}else{
NSLog(@"===");
}
二、 一般的使用场景
监听UITextField、UITextView 等等
- (void)viewDidLoad {
[super viewDidLoad];
// 监听textfiled 和 keyboard
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textfiledChangeValue:) name:UITextFieldTextDidChangeNotification object:self.textfiled];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeKeyboardHeight:) name:UIKeyboardWillShowNotification object:nil];
}
// textfiled
- (void)textfiledChangeValue:(NSNotification *)notification {
UITextField *filed = notification.object;
NSString *str = filed.text;
NSString *language = [filed.textInputMode primaryLanguage];
if ([language isEqualToString:@"zh-Hans"]) { // 第一语言 zh-Hans 中文
NSString *regex = @"^[a-zA-Z0-9u4e00-u9fa5]+";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
BOOL isMatch = [predicate evaluateWithObject:str];
if (isMatch) {
NSLog(@"it is beyond of limit number");
}else {
NSLog(@"it can't containt unexpected symbol");
}
}
}
- (void)changeKeyboardHeight:(NSNotification *)notificaton {
CGFloat keyboardHeight = [notificaton.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;
self.marginTop.constant = - 100;
}