if ([[dict allKeys] containsObject:key) { // contains key }
// contains key
}
if ([dict objectForKey:key]) { //objectForKey will return nil if a key doesn't exists. // contains key }
// contains key
}
if ([[dict allKeys] containsObject:key) { // contains key }
// contains key
}
if ([dict objectForKey:key]) { //objectForKey will return nil if a key doesn't exists. // contains key }
// contains key
}