输入价格的格式判断
@property (nonatomic, assign) BOOL isHaveDian;
@property (nonatomic, assign) BOOL isFirstZero;
@property (nonatomic, strong) UITextField* startText;
遵循UITextField协议，并实现shouldChangeCharactersInRange方法
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if (textField ==self.startText) {
return [self panDuanTextField:textField shouldChangeCharactersInRange:range replacementString:string];
}
}
return YES;
}
-(BOOL)panDuanTextField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if ([textField.text rangeOfString:@"."].location==NSNotFound) {
_isHaveDian = NO;
}
if ([textField.text rangeOfString:@"0"].location==NSNotFound) {
_isFirstZero = NO;
}
if ([string length]>0)
{
unichar single=[string characterAtIndex:0];//当前输入的字符
if ((single >='0' && single<='9') || single=='.')//数据格式正确
{
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=='.'){
if(!_isHaveDian)//text中还没有小数点
{
_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;
}
