//限制输入长度并只能输入数字
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
if (textField == self.numberTextF) {
//这里的if时候为了获取删除操作,如果没有次if会造成当达到字数限制后删除键也不能使用的后果.
if (range.length == 1 && string.length == 0) {
return YES;
}
//so easy
else if (self.numberTextF.text.length >= 8) {
self.numberTextF.text = [textField.text substringToIndex:8];
return NO;
}
}
return [self validateNumber:string];
}
- (BOOL)validateNumber:(NSString*)number {
BOOL res = YES;
NSCharacterSet* tmpSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
int i = 0;
while (i < number.length) {
NSString * string = [number substringWithRange:NSMakeRange(i, 1)];
NSRange range = [string rangeOfCharacterFromSet:tmpSet];
if (range.length == 0) {
res = NO;
break;
}
i++;
}
return res;
}
//限制输入长度并只能输入数字和小数
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if (textField == self.numberTextF) {
if ([textField.text rangeOfString:@"."].location==NSNotFound) {
_isHaveDian = NO;
}
if ([textField.text rangeOfString:@"0"].location==NSNotFound) {
_isFirstZero = NO;
}
if ([string length]>0) {
//这里的if时候为了获取删除操作,如果没有次if会造成当达到字数限制后删除键也不能使用的后果.
if (range.length == 1 && string.length == 0) {
return YES;
}
//so easy
else if (self.numberTextF.text.length >= 8) {
self.numberTextF.text = [textField.text substringToIndex:8];
return NO;
}
//当前输入的字符
unichar single=[string characterAtIndex:0];
//数据格式正确
if ((single >='0' && single<='9') || single=='.') {
if([textField.text length]==0){
if(single == '.'){
//首字母不能为小数点
return NO;
}
if (single == '0') {
_isFirstZero = YES;
return YES;
}
}
if (single=='.') {
//text中还没有小数点
if(!_isHaveDian) {
_isHaveDian=YES;
return YES;
}else{
return NO;
}
}else if(single=='0') {
if ((_isFirstZero&&_isHaveDian)||(!_isFirstZero&&_isHaveDian)) {
//首位有0有.（0.01）或首位没0有.（10200.00）可输入两位数的0
if([textField.text isEqualToString:@"0.0"]){
return NO;
}
NSRange ran=[textField.text rangeOfString:@"."];
int tt=(int)(range.location-ran.location);
if (tt <= 2){
return YES;
}else{
return NO;
}
}else if (_isFirstZero&&!_isHaveDian){
//首位有0没.不能再输入0
return NO;
}else{
return YES;
}
}else {
if (_isHaveDian) {
//存在小数点，保留两位小数
NSRange ran=[textField.text rangeOfString:@"."];
int tt= (int)(range.location-ran.location);
if (tt <= 2){
return YES;
}else{
return NO;
}
}else if(_isFirstZero&&!_isHaveDian){
//首位有0没点
return NO;
}else{
return YES;
}
}
}else{
//输入的数据格式不正确
return NO;
}
}else {
return YES;
}
}
return YES;
}
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