textfield只显示小数点后两位，以及不能出现两个小数点

来源：互联网发布：医学数据可视化ppt 编辑：程序博客网时间：2024/06/07 05:31

_textField=[[UITextFieldalloc]initWithFrame:CGRectMake(10,100, 300, 40)];

_textField.placeholder=@"请输入手机号码";

_textField.delegate=self;

[_textFieldaddTarget:selfaction:@selector(textFieldChange:)forControlEvents:UIControlEventEditingChanged];

_textField.leftViewMode=UITextFieldViewModeAlways;

_textField.rightViewMode=UITextFieldViewModeAlways;

_textField.keyboardType=UIKeyboardTypeDecimalPad;

[self.viewaddSubview:_textField];

//只显示小数点后两位，以及不能出现两个小数点

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

if (textField ==self.textField) {

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;

}

returnYES;

}

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