IOS-如何幹掉UITextField的長按手勢選單與輸入內容限制
今天專案用到了這個就寫一下，方便以後同學不會的時候可以直接使用
首先要重寫UITextFiled子類 在初始化方法下面 copy 下面方法 就禁止了長按出現的選單
//幹掉textField 的長按選單 禁止copy paste
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
if ([UIMenuControllersharedMenuController]) {
[UIMenuControllersharedMenuController].menuVisible = NO;
}
return NO;
}
在開發中我們有時候會對UITextFiled 進行一些操作，說一下如何只輸入中文，或者 只輸入 數字 和英文 2中方法
我直接用巨集定義定義：
#define kAlphaNum @"abcdefghijklmnopqrstuvwxyz" //這種是對應只輸入中文 不允許其他數字或者符號的
#define kEnglishNum @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" //這種是對應只能輸入數字和英文的方法
執行UITextField 的delegate 方法 切記 textFiled.delegate = self;
下面直接上程式碼:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{UITextField *nameField = (UITextField *)[self viewWithTag:200];
UITextField *cardField = (UITextField *)[self viewWithTag:201];
if (textField == nameField) {
//只允許輸入中文
NSCharacterSet *cs;
cs = [[NSCharacterSetcharacterSetWithCharactersInString:kAlphaNum] invertedSet];
NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
BOOL basic = [string isEqualToString:filtered];
NSString *text = [textField.text stringByReplacingCharactersInRange:range withString:string];
if (_delegate && [_delegate respondsToSelector:@selector(passName:)]) {
[_delegate passName:text];
}
return basic;
}
if (textField == cardField) {
//只允許輸入英文和數字
NSCharacterSet *cs;
cs = [[NSCharacterSetcharacterSetWithCharactersInString:kEnglishNum] invertedSet];
NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
BOOL basic = [string isEqualToString:filtered];
NSString *text = [textField.text stringByReplacingCharactersInRange:range withString:string];
if (_delegate && [_delegate respondsToSelector:@selector(passCard:)]) {
[_delegate passCard:text];
}
return basic;
}
return YES;
}