用户偏好设置
存储用户的偏好设置,存储在本地, 比如程序是否是第一次加载
NSUserDefaults * userDefults = [NSUserDefaults standardUserDefaults];
if (![userDefults boolForKey:@"aa"]) {
[self setupFirstLanchView];
[userDefults setBool:YES forKey:@"aa"];
[userDefults synchronize]; 立即同步. .
}
创建程序第一次加载要显示的视图
- (void)setupFirstLanchView
{
[self setupScrollView];
[self setupPageControl];
}