iOS --- APP之間相互跳轉

iOS --- APP之間相互跳轉

iOS裝置中, APP之間的相互跳轉主要是通過UIApplication的openURL來實現的.
以Instagram(未提供SDK)為例:

////  ViewController.m#import ViewController.h@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    NSString *username = @icetime017;    [self openUserPage:username];}- (BOOL)isInstagramInstalled {    NSURL *instagramURL = [NSURL URLWithString:@instagram://location?id=1];    return [[UIApplication sharedApplication] canOpenURL:instagramURL];}- (void)openUserPage:(NSString *)username {    NSURL *fansPageURL;    if ([self isInstagramInstalled]) {        fansPageURL = [NSURL URLWithString:[NSString stringWithFormat:@instagram://user?username=%@, username]];    } else {        fansPageURL = [NSURL URLWithString:[NSString stringWithFormat:@http://instagram.com/%@, username]];    }    [[UIApplication sharedApplication] openURL:fansPageURL];}@end

即:
使用[[UIApplication sharedApplication] canOpenURL:instagramURL];來判斷是否已安裝該APP,
使用[[UIApplication sharedApplication] openURL:fansPageURL];來開啟該APP, 若未安裝, 則預設在safari中開啟相應頁面.