canOpenURL failing for system-wide URL schemes

Question

I\'m running iOS 9b5.

In my app, if a device can make a phone call, I want to color the text blue so it looks tappable. If not, I leave it black.

In order to

Answer 1

As iOS9 deprecates stringByAddingPercentEscapesUsingEncoding, the following can be used to clean the telprompt: URL.

NSString *cleanedString = [[[PHONE NUMBER] componentsSeparatedByCharactersInSet:[[NSCharacterSet characterSetWithCharactersInString:@"0123456789-+()"] invertedSet]] componentsJoinedByString:@""];
//NSString *escapedPhoneNumber = [cleanedString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *escapedPhoneNumber = [cleanedString stringByAddingPercentEncodingWithAllowedCharacters: [NSCharacterSet URLQueryAllowedCharacterSet]];
NSString *phoneURLString = [NSString stringWithFormat:@"telprompt:%@", escapedPhoneNumber];
NSURL *phoneURL = [NSURL URLWithString:phoneURLString];

if ([[UIApplication sharedApplication] canOpenURL:phoneURL]) {
    [[UIApplication sharedApplication] openURL:phoneURL];
}