iOS 添加功能引导图

首次安装app之后，打开app首页，有一张功能引导图，其实最简单的一种做法是，直接在这个首页上加一个蒙层图片。
在蒙层上用气泡显示文字注明功能介绍，这个蒙层图片，让你们的UI设计师给你。

然后在进入首页的viewDidAppear方法里，添加上你的蒙层

[self initIntroduceView];

下面是添加的简单示例代码：

示例

- (void)initIntroduceView
{
    if (![USERDEFAULT objectForKey:@"IsShowIntro"]) {
        UIImageView *introImg = [[UIImageView alloc] initWithFrame:self.view.bounds];
        introImg.tag = INTRO_TAG;
        introImg.userInteractionEnabled = YES;
        if (iPhone4S) {
            introImg.image = [UIImage imageNamed:@"explanation_960"];
        }
        else
        {
            introImg.image = [UIImage imageNamed:@"explanation"];
        }
        [self.tabBarController.view addSubview:introImg];
        
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(removeIntroImg)];
        tap.numberOfTapsRequired = 1;
        
        [introImg addGestureRecognizer:tap];
    }
    
}

- (void)removeIntroImg
{
    [USERDEFAULT setObject:[NSNumber numberWithBool:YES] forKey:@"IsShowIntro"];
    UIImageView *imgView = (UIImageView *)[self.tabBarController.view viewWithTag:INTRO_TAG];
    [imgView removeFromSuperview];

}

关于几个宏

#define USERDEFAULT [NSUserDefaults standardUserDefaults]
#define iPhone4S ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)
#define INTRO_TAG 50000