Cocoa 限制NSTextField仅允许数字
如何限制Cocoa 限制NSTextField仅允许数字,cocoa,nstextfield,Cocoa,Nstextfield,如何限制NSTextfield仅允许数字/整数?我发现了像这样的问题,但没有帮助 试试这个- NSNumberFormatter *formatter = [[[NSNumberFormatter alloc] init] autorelease]; [formatter setNumberStyle:NSNumberFormatterDecimalStyle]; [textField setFormatter:formatter]; 尝试创建自己的NSNumberFormatter子类,并检
NSTextfield
仅允许数字/整数?我发现了像这样的问题,但没有帮助 试试这个-
NSNumberFormatter *formatter = [[[NSNumberFormatter alloc] init] autorelease];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[textField setFormatter:formatter];
尝试创建自己的
NSNumberFormatter
子类,并检查-isPartialStringValid:newEditingString:errorDescription:
方法中的输入值
@interface OnlyIntegerValueFormatter : NSNumberFormatter
@end
@implementation OnlyIntegerValueFormatter
- (BOOL)isPartialStringValid:(NSString*)partialString newEditingString:(NSString**)newString errorDescription:(NSString**)error
{
if([partialString length] == 0) {
return YES;
}
NSScanner* scanner = [NSScanner scannerWithString:partialString];
if(!([scanner scanInt:0] && [scanner isAtEnd])) {
NSBeep();
return NO;
}
return YES;
}
@end
然后将此格式化程序设置为NSTextField
:
OnlyIntegerValueFormatter *formatter = [[[OnlyIntegerValueFormatter alloc] init] autorelease];
[textField setFormatter:formatter];
这里有一个过滤的解决方案。为textfield提供一个委托和一个出口,并设置controlTextDidChange方法
- (void)controlTextDidChange:(NSNotification *)aNotification {
NSTextField *textfield = [notification object];
NSCharacterSet *charSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
char *stringResult = malloc([textfield.stringValue length]);
int cpt=0;
for (int i = 0; i < [textfield.stringValue length]; i++) {
unichar c = [textfield.stringValue characterAtIndex:i];
if ([charSet characterIsMember:c]) {
stringResult[cpt]=c;
cpt++;
}
}
stringResult[cpt]='\0';
textfield.stringValue = [NSString stringWithUTF8String:stringResult];
free(stringResult);
}
-(void)controlTextDidChange:(NSNotification*)通知{
NSTextField*textfield=[通知对象];
NSCharacterSet*charSet=[NSCharacterSet characterSetWithCharactersInString:@“0123456789”];
char*stringResult=malloc([textfield.stringValue-length]);
int-cpt=0;
对于(int i=0;i<[textfield.stringValue-length];i++){
unichar c=[textfield.stringValue characterAtIndex:i];
如果([字符集成员:c]){
stringResult[cpt]=c;
cpt++;
}
}
stringResult[cpt]='\0';
textfield.stringValue=[NSString stringWithUTF8String:stringResult];
免费(结果);
}
以下是创建相同的
只需通过对NSNumberFormatter进行子分类来创建ANYCLASS(称为SAMPLE)
在.m文件中编写以下代码
- (BOOL)isPartialStringValid:(NSString *)partialString newEditingString:(NSString **)newString errorDescription:(NSString **)error {
// Make sure we clear newString and error to ensure old values aren't being used
if (newString) { *newString = nil;}
if (error) {*error = nil;}
static NSCharacterSet *nonDecimalCharacters = nil;
if (nonDecimalCharacters == nil) {
nonDecimalCharacters = [[NSCharacterSet decimalDigitCharacterSet] invertedSet] ;
}
if ([partialString length] == 0) {
return YES; // The empty string is okay (the user might just be deleting everything and starting over)
} else if ([partialString rangeOfCharacterFromSet:nonDecimalCharacters].location != NSNotFound) {
return NO; // Non-decimal characters aren't cool!
}
return YES;
}
现在。。在实际类中,将格式化程序设置为NSTextField对象,如下所示
NSTextField *mySampleTxtFld;
对于此设置,格式化程序
SAMPLE* formatter=[[SAMPLE alloc]init];// create SAMPLE FORMATTER OBJECT
self.mySampleTxtFld.delegate=self;
[self.mySampleTxtFld setFormatter:formatter];
你的任务完成了 以下是Swift版本:
override func isPartialStringValid(partialString: String, newEditingString newString: AutoreleasingUnsafeMutablePointer<NSString?>, errorDescription error: AutoreleasingUnsafeMutablePointer<NSString?>) -> Bool {
if (count(partialString.utf16)) {
return true
}
if (partialString.rangeOfCharacterFromSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet) != nil) {
NSBeep()
return false
}
return true
}
重写函数isPartialString有效(partialString:String,newEditingString:newString:AutoreleasingUnsafemtablePointer,errorDescription error:AutoreleasingUnsafemtablePointer)->Bool{
if(计数(部分字符串utf16)){
返回真值
}
if(partialString.rangeOfCharacterFromSet(NSCharacterSet.decimalDigitCharacterSet().InversedSet)!=nil){
NSBeep()
返回错误
}
返回真值
}
在SWIFT中,我是这样做的
if ((Int(txtField.stringValue)) < 0){
// Display error message
}
if((Int(txtField.stringValue))<0){
//显示错误消息
}
Swift 2.0自定义格式设置程序,使用0代替空白:
class OnlyIntegerValueFormatter: NSNumberFormatter {
override func isPartialStringValid(partialString: String, newEditingString newString: AutoreleasingUnsafeMutablePointer<NSString?>, errorDescription error: AutoreleasingUnsafeMutablePointer<NSString?>) -> Bool {
if partialString.isEmpty {
newString.memory = "0"
return false
}
if Int(partialString) < 0 {
NSBeep()
return false
} else {
return true
}
}
}
仅类IntegerValueFormatter:NSNumberFormatter{
重写函数IsPartialString有效(partialString:String,newEditingString新闻字符串:AutoreleasingUnsafemtablePointer,errorDescription错误:AutoreleasingUnsafemtablePointer)->Bool{
如果partialString.isEmpty{
newString.memory=“0”
返回错误
}
如果Int(partialString)<0{
NSBeep()
返回错误
}否则{
返回真值
}
}
}
Swift 3版本
import Foundation
class OnlyIntegerValueFormatter: NumberFormatter {
override func isPartialStringValid(_ partialString: String, newEditingString newString: AutoreleasingUnsafeMutablePointer<NSString?>?, errorDescription error: AutoreleasingUnsafeMutablePointer<NSString?>?) -> Bool {
// Ability to reset your field (otherwise you can't delete the content)
// You can check if the field is empty later
if partialString.isEmpty {
return true
}
// Optional: limit input length
/*
if partialString.characters.count>3 {
return false
}
*/
// Actual check
return Int(partialString) != nil
}
}
[适用于Swift 3.0.1] 正如其他人所建议的,子类
NumberFormatter
和重写isPartialStringValid
方法。最简单的方法是将NumberFormatter
对象放到xib/storyboard中的NSTextField
下,并更新其自定义类。
下一个实现只允许整数或空值,如果字符串包含非法字符,则会播放嘟嘟声
class IntegerFormatter: NumberFormatter {
override func isPartialStringValid(_ partialString: String, newEditingString newString: AutoreleasingUnsafeMutablePointer<NSString?>?, errorDescription error: AutoreleasingUnsafeMutablePointer<NSString?>?) -> Bool {
// Allow blank value
if partialString.numberOfCharacters() == 0 {
return true
}
// Validate string if it's an int
if partialString.isInt() {
return true
} else {
NSBeep()
return false
}
}
}
@giorashc谢谢你,我找到了,但是没有帮助:(你需要说明为什么你找到的其他问题没有帮助。哦,对不起,W'RKNCANCENTER,我不知道把代码放在哪里,答案不清楚……(至少对我来说)谢谢你的回答,但出于某种原因,它仍然不允许只使用数字:(但我会继续尝试……顺便说一句,代码应该也在哪里?在Interface Builder中,将一个NSObject放到xib上,并将其类设置为自定义格式化程序(如上所述)。然后设置/拖动NSTextFields“formatter”出口到该NSObject。然后你不需要任何代码来应用格式化程序。它工作正常…但当我尝试输入多个零(0)…例如000000…它不接受…任何帮助请?string。utf16Count
在swift 1.2中不再可用。你应该将其更改为count(partialString.utf16)
。实际上,这在很多层面上都是错误的。首先,数字不是布尔可转换的,其次,您需要检查isEmpty
。如果字符串的长度大于零,则必须彻底检查。使用了一点逻辑!
class IntegerFormatter: NumberFormatter {
override func isPartialStringValid(_ partialString: String, newEditingString newString: AutoreleasingUnsafeMutablePointer<NSString?>?, errorDescription error: AutoreleasingUnsafeMutablePointer<NSString?>?) -> Bool {
// Allow blank value
if partialString.numberOfCharacters() == 0 {
return true
}
// Validate string if it's an int
if partialString.isInt() {
return true
} else {
NSBeep()
return false
}
}
}
extension String {
func isInt() -> Bool {
if let intValue = Int(self) {
if intValue >= 0 {
return true
}
}
return false
}
func numberOfCharacters() -> Int {
return self.characters.count
}
}