objective-c - 仅在第一次运行 iOS 时执行功能

Question

有什么方法可以让我只运行一次函数(当更新或安装应用程序时)？

我不能使用运行脚本，因为我应该使用 Objective-C 函数。

Answer 1

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    
if ( ![userDefaults valueForKey:@"version"] )
{
    // CALL your Function;

    // Adding version number to NSUserDefaults for first version:
    [userDefaults setFloat:[[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"] floatValue] forKey:@"version"];    
}

if ([[NSUserDefaults standardUserDefaults] floatForKey:@"version"] == [[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"] floatValue] )
{
    // Same Version so dont run the function
}
else
{
    // Call Your Function;

    // Update version number to NSUserDefaults for other versions:
    [userDefaults setFloat:[[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"] floatValue] forKey:@"version"];
}