以编程方式启动iOS Safari并进行默认搜索?

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    NSString * urlString = @"x-web-search://?keyword";
if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:urlString]]) {
    if (iOS10) {
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlString] options:@{} completionHandler:nil];
    } else {
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlString]];
    }
}

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