Launch Apple Mail App from within my own App?

Apparently Mail application supports 2nd url scheme - message:// which ( I suppose) allows to open specific message if it was fetched by the application. If you do not provide message url it will just open mail application:

NSURL* mailURL = [NSURL URLWithString:@"message://"];if ([[UIApplication sharedApplication] canOpenURL:mailURL]) {    [[UIApplication sharedApplication] openURL:mailURL];}

NSString *recipients = @"mailto:first@example.com?cc=second@example.com,third@example.com&subject=Hello from California!";NSString *body = @"&body=It is raining in sunny California!";NSString *email = [NSString stringWithFormat:@"%@%@", recipients, body];email = [email stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];[[UIApplication sharedApplication] openURL:[NSURL URLWithString:email]];

Swift version of the original Amit's answer:

Swift 2:

func openMailApp() {        let toEmail = "email@outlook.com"    let subject = "Test email".stringByAddingPercentEncodingWithAllowedCharacters(.URLHostAllowedCharacterSet()    let body = "Just testing ...".stringByAddingPercentEncodingWithAllowedCharacters(.URLHostAllowedCharacterSet()        if let        urlString = ("mailto:\(toEmail)?subject=\(subject)&body=\(body)")),        url = NSURL(string:urlString) {        UIApplication.sharedApplication().openURL(url)    }}

Swift 3.0:

func openMailApp() {        let toEmail = "email@outlook.com"    let subject = "Test email".addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)    let body = "Just testing ...".addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)        if       let urlString = "mailto:\(toEmail)?subject=\(subject)&body=\(body)",      let url = URL(string:urlString)     {        UIApplication.shared().openURL(url)    }}