textField和textView限制輸入條件，textfieldtextview

textField和textView限制輸入條件，textfieldtextview

以下兩法方法都是實現textfield和textView的代理方法  需要先遵循代理

一：textField限制只能輸入數字和小數點 且小數點後只能保留兩位 小數點前最多5位 

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{    //  輸入框中的值 只能輸入到小數點後兩位     if (string.length == 0) {        return YES;     }    const char * ch=[string cStringUsingEncoding:NSUTF8StringEncoding];    if(*ch == 0)        return YES;    if( *ch != 46 && ( *ch<48 || *ch>57) )        return NO;    if([textField.text rangeOfString:@"."].length==1)    {        NSUInteger length=[textField.text rangeOfString:@"."].location;        if([[textField.text substringFromIndex:length] length]>2 || *ch ==46)            return NO;    }else{        NSInteger existedLength = textField.text.length;        NSInteger selectedLength = range.length;        NSInteger replaceLength = string.length;        if (existedLength - selectedLength + replaceLength > 5&&![string isEqualToString: @"."]) {            return NO;        }    }    return YES;}

二：textView限制輸入字數，這裡限制為25字以內

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{    if ([text isEqualToString:@""] && range.length > 0) {        return YES;    }else {        if (textView.text.length - range.length + text.length > 25) {            return NO;        }else {            return YES;        }    }}