for loop with array ios [closed] - ios

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Closed 10 years ago.
I have to find a way to check (at the touch of a button) if the text in a textfield is present in an xml file.
I thought that if I load the xml file as an array then I could use a for loop to see if it is the same result as in the array.
are not at all practical for loops, could you explain me how can I write the code for this kind of problem?
I want that if the object is not present in the whole array then show the alert
thanks
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
cose = [[NSArray alloc] initWithObjects:#"giovanni",#"giulio",#"ciccio",#"panzo", nil];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(IBAction)prova {
for (NSString *myElement in cose) {
if ([myElement isEqualToString:textfield1.text]) {
label1.text = textfield1.text;
}
else {
UIAlertView *alertCellulare = [[UIAlertView alloc] initWithTitle:#"Attenzione!" message:#"connessione assente" delegate:self cancelButtonTitle:#"ok" otherButtonTitles:nil, nil];
[alertCellulare show];
}
}
}

Answer 1

With fast-enumeration:
-(IBAction)prova
{
BOOL present = NO;
for (NSString *myElement in cose) {
if ([myElement isEqualToString:textfield1.text]) {
label1.text = textfield1.text;
present = YES;
break;
}
}
if (!present){
UIAlertView *alertCellulare = [[UIAlertView alloc] initWithTitle:#"Attenzione!" message:#"connessione assente" delegate:self cancelButtonTitle:#"ok" otherButtonTitles:nil, nil];
[alertCellulare show];
}
}
with block based enumeration
-(IBAction)prova
{
__block BOOL present = NO;
[cose enumerateObjectsUsingBlock:^(NSString *name, NSUInteger idx, BOOL *stop){
if ([name isEqualToString:textfield1.text]) {
label1.text = textfield1.text;
present = YES;
*stop = YES;
}
}];
if (!present){
UIAlertView *alertCellulare = [[UIAlertView alloc] initWithTitle:#"Attenzione!" message:#"connessione assente" delegate:self cancelButtonTitle:#"ok" otherButtonTitles:nil, nil];
[alertCellulare show];
}
}

Answer 2

Why not use a For-In loop (fast enumeration)?
Something like this:
for (NSString *myElement in myArray) {
if ([myElement isEqualToString:myTextField.text]) {
// Do something
}
}