Random websites button

问题

this one is pretty simple I guess but I just can't find the answer that would suit perfectly for my issue. I want to make a button that opens a random URL from a list I'll give him, let's say - google, youtube and facebook just for the example. This is my line of code that connects now only to google...:

- (IBAction)site:(id)sender {
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://google.com"]];
}

Can someone please advise me what to add to the code so it will randomly pick these other websites as well?

回答1:

Like Popeye said, you can store the URLs into a NSArray and pick one of them randomly:

#include <stdlib.h>

- (IBAction)site:(id)sender {
    NSArray *urls = @[
        [NSURL URLWithString:@"http://www.google.com"],
        [NSURL URLWithString:@"http://www.facebook.com"],
        [NSURL URLWithString:@"http://www.twitter.com"]
    ];

    int index = arc4random_uniform(urls.count);
    NSURL *randomURL = urls[index];

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

来源：https://stackoverflow.com/questions/28014872/random-websites-button