判断输入金额，很完善

来源：互联网发布：先导爱知编辑：程序博客网时间：2024/06/05 22:41

//判断输入金额

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{

if ([textField.textrangeOfString:@"."].location==NSNotFound) {

isHaveDian =NO;

}

if ([textField.textrangeOfString:@"0"].location==NSNotFound) {

isFirstZero =NO;

}

if ([stringlength]]]>0)

{

unichar single=[stringcharacterAtIndex:0];//当前输入的字符

if ((single >='0' && single<='9') || single=='.')//数据格式正确

{

if([textField.textlength]==0){

if(single =='.'){

//首字母不能为小数点

returnNO;

}

if (single =='0') {

isFirstZero =YES;

returnYES;

}

if (single=='.'){

if(!isHaveDian)//text中还没有小数点

{

isHaveDian=YES;

returnYES;

}else{

returnNO;

}

}elseif(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.textisEqualToString:@"0.0"]){

returnNO;

}

NSRange ran=[textField.textrangeOfString:@"."];

int tt=(int)(range.location-ran.location);

if (tt <=2){

returnYES;

}else{

returnNO;

}

}elseif (isFirstZero&&!isHaveDian){

//首位有0没.不能再输入0

returnNO;

}else{

returnYES;

}

}else{

if (isHaveDian){

//存在小数点，保留两位小数

NSRange ran=[textField.textrangeOfString:@"."];

int tt= (int)(range.location-ran.location);

if (tt <=2){

returnYES;

}else{

returnNO;

}

}elseif(isFirstZero&&!isHaveDian){

//首位有0没点

returnNO;

}else{

returnYES;

}

}else{

//输入的数据格式不正确

returnNO;

}

}else{

returnYES;

}

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