I need to remove the first character from my UITextfield
if it's a 0.
Unfortunately I don't know how to extract the value of the first character or extract the characters of the string after the first character.
Thanks
One solution could be:
if ([string hasPrefix:@"0"] && [string length] > 1) {
string = [string substringFromIndex:1];
}
You would probably want something like this, using hasPrefix:
if ([string hasPrefix:@"0"]) {
string = [string substringFromIndex:1];
}
You could also use characterAtIndex: which returns a unichar:
if ([string characterAtIndex:0] == '0') {
string = [string substringFromIndex:1];
}
Note that, 'a' is character, "a" is C string and @"a" is NSString. They all are different types.
Swift 3.0:
var myString = "Hello, World"
myString.remove(at: myString.startIndex)
myString // "ello, World"
Swift 3
hasPrefix("0") check if the first character is 0 in txtField and remove it
if (self.txtField.text?.hasPrefix("0"))! {
self.txtField.text?.remove(at(self.txtField.text?.startIndex)!)
}
SWIFT 5.0 you can use the following sequence function to check whether string starts with "0" or not
if search.starts(with: "0") {
search.remove(at: search.startIndex)
print("After Trim search is",search)
} else {
print("First char is not 0")
}
Replace the string variable with your current variable name. I hope this helps you
While loop to keep removing first character as long as it is zero
while (self.ammountTextField.text?.hasPrefix("0"))! {
self.ammountTextField.text?.remove(at: (self.ammountTextField.text?.startIndex)!)
}
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