Limit input, enter amount and retain two decimal places

Determines whether a floating-point type

+ (BOOL) Ispurefloat: (nsstring*) string {
nsscanner* scan = [Nsscanner scannerwithstring:string];
float Val;
return [scan scanfloat:&val] && [scan isatend];
}

Limit the number of input bits in textfiled

if ([string isequaltostring:@ "]) {

return YES;

}

NSString *text = [Textfield.text stringbyreplacingcharactersinrange:range withstring:string];

if ([Mytool Ispurefloat:text]) {

if ([text Doublevalue] <= [_balance Doublevalue]) {

Two digits after the decimal point

Nsuinteger location = [Text rangeofstring:@ "]. Location

if (location = Nsnotfound && text.length > location + 3) {

return NO;

}else {

return YES;

}

}

}

return NO;

Limit input, enter amount and retain two decimal places