The reason why == works is because of pointer comparison. When you define a constant NSString using @””, the compiler uniquifies the reference. When the same constants are defined in other places in your code, they will all point to the same actual location in memory. When comparing NSString instances, you should use the isEqualToString: … Read more
You can do exactly the same call with Swift: Swift 4 & Swift 5 In Swift 4 String is a collection of Character values, it wasn’t like this in Swift 2 and 3, so you can use this more concise code1: let string = “hello Swift” if string.contains(“Swift”) { print(“exists”) } Swift 3.0+ var string … Read more
As of Swift 4 (Xcode 9), the Swift standard library provides methods to convert between Swift string ranges (Range<String.Index>) and NSString ranges (NSRange). Example: let str = “a👿b🇩🇪c” let r1 = str.range(of: “🇩🇪”)! // String range to NSRange: let n1 = NSRange(r1, in: str) print((str as NSString).substring(with: n1)) // 🇩🇪 // NSRange back to String … Read more
If the data is not null-terminated, you should use -initWithData:encoding: NSString* newStr = [[NSString alloc] initWithData:theData encoding:NSUTF8StringEncoding]; If the data is null-terminated, you should instead use -stringWithUTF8String: to avoid the extra \0 at the end. NSString* newStr = [NSString stringWithUTF8String:[theData bytes]]; (Note that if the input is not properly UTF-8-encoded, you will get nil.) Swift … Read more
Unfortunately, stringByAddingPercentEscapesUsingEncoding doesn’t always work 100%. It encodes non-URL characters but leaves the reserved characters (like slash / and ampersand &) alone. Apparently this is a bug that Apple is aware of, but since they have not fixed it yet, I have been using this category to url-encode a string: @implementation NSString (NSString_Extended) – (NSString … Read more
An option: [NSString stringWithFormat:@”%@/%@/%@”, one, two, three]; Another option: I’m guessing you’re not happy with multiple appends (a+b+c+d), in which case you could do: NSLog(@”%@”, [Util append:one, @” “, two, nil]); // “one two” NSLog(@”%@”, [Util append:three, @”https://stackoverflow.com/”, two, @”https://stackoverflow.com/”, one, nil]); // three/two/one using something like + (NSString *) append:(id) first, … { NSString … Read more
Since you haven’t posted any code, it’s difficult to know exactly which problems you’re encountering. However, the blog post you link to does seem to work pretty decently… aside from the extra comma in each call to CCCrypt() which caused compile errors. A later comment on that post includes this adapted code, which works for … Read more
Swift 4 and later Updated: 2018 String to Date var dateString = “02-03-2017” var dateFormatter = DateFormatter() // This is important – we set our input date format to match our input string // if the format doesn’t match you’ll get nil from your string, so be careful dateFormatter.dateFormat = “dd-MM-yyyy” //`date(from:)` returns an optional … Read more
You should create a header file like: // Constants.h FOUNDATION_EXPORT NSString *const MyFirstConstant; FOUNDATION_EXPORT NSString *const MySecondConstant; //etc. (You can use extern instead of FOUNDATION_EXPORT if your code will not be used in mixed C/C++ environments or on other platforms.) You can include this file in each file that uses the constants or in the … Read more
Assuming you have myUIView defined as a property, e.g. @property (nonatomic, strong) IBOutlet UIView *myUIView; then you can access it from a string with the -valueForKey: method, as in [self valueForKey:@”myUIView”]