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iOS常用代码片段

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记录 iOS 常用代码片段。

判断当前网络状态 Demo

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/** 网络状态枚举 */
typedef NS_ENUM(NSUInteger, SYNetworkState) {
    SYNetwork_Unknow        = 0x00,         // 未知
    SYNetwork_No            = 0x01,         // 无网络
    SYNetwork_2G            = 0x02,         // 2G 网络
    SYNetwork_3G            = 0x03,         // 3G 网络
    SYNetwork_4G            = 0x04,         // 4G 网络
    SYNetwork_WiFi          = 0x05,         // WiFi 网络
};


#pragma mark -- 判断网络状态
+ (SYNetworkState)syNetworkState
{
    UIApplication *application = [UIApplication sharedApplication];
    NSArray *subViewArray;
    // iPhone X
    if ([[application valueForKeyPath:@"_statusBar"] isKindOfClass:NSClassFromString(@"UIStatusBar_Modern")])
    {
        subViewArray = [[[[application valueForKeyPath:@"_statusBar"] valueForKeyPath:@"_statusBar"] valueForKeyPath:@"foregroundView"] subviews];
    }
    else    // 其他
    {
        subViewArray = [[[application valueForKeyPath:@"_statusBar"] valueForKeyPath:@"foregroundView"] subviews];
    }
    
    int netType = 0;
    SYNetworkState netState = SYNetwork_Unknow;
    for (id subView in subViewArray)
    {
        if (![subView isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")])
        {
            continue;
        }
        netType = [[subView valueForKeyPath:@"dataNetworkType"] intValue];
    }
    switch (netType)
    {
        case 0:
            netState = SYNetwork_No;
            break;
            
        case 1:
            netState = SYNetwork_2G;
            break;
            
        case 2:
            netState = SYNetwork_3G;
            break;
            
        case 3:
            netState = SYNetwork_4G;
            break;
            
        case 5:
            netState = SYNetwork_WiFi;
            break;
            
        default:
            netState = SYNetwork_Unknow;
            break;
    }
    return netState;
}

屏幕亮度渐变 Demo

  1. 在 didFinishLaunchingWithOptions: 保存默认亮度值。

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    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:NO]
                                                 forKey:IS_NEED_CHANGE_BRIGHTNESS];
       [GradualBrightness sySaveDefaultBrightness];

  2. 在 applicationWillResignActive: 恢复默认亮度值（如果需要）。

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    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
       BOOL isNeedChangeBrightness = [[userDefault objectForKey:IS_NEED_CHANGE_BRIGHTNESS] boolValue];
       if (YES == isNeedChangeBrightness)
       {
           [GradualBrightness syResumeBrightness];
       }

  3. 在 applicationDidBecomeActive: 设定新亮度值（如果需要）。

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    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
       BOOL isNeedChangeBrightness = [[userDefault objectForKey:IS_NEED_CHANGE_BRIGHTNESS] boolValue];
       if (YES == isNeedChangeBrightness)
       {
           [GradualBrightness syConfigBrightness:CUSTOM_BRIGHTNESS_VAULE];
       }

  4. 在 viewWillAppear: 设定新亮度值（同时设为需要）。

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    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:YES]
                                                 forKey:IS_NEED_CHANGE_BRIGHTNESS];
       [GradualBrightness syConfigBrightness:CUSTOM_BRIGHTNESS_VAULE];

  5. 在 viewWillDisappear: 恢复默认亮度值（同时设为不需要）。

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    [GradualBrightness syResumeBrightness];
       [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:NO]
                                                 forKey:IS_NEED_CHANGE_BRIGHTNESS];

  6. 实现代码

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    /** 亮度变换步幅 */
    #define GRADUAL_STRIDE  0.005f

    static CGFloat defaultBrightness;
    static NSOperationQueue *changeBrightnessQueue;


    #pragma mark -- 保存默认亮度值
    + (void)sySaveDefaultBrightness
    {
        defaultBrightness = [UIScreen mainScreen].brightness;
    }


    #pragma mark -- 逐步设置亮度
    + (void)syConfigBrightness:(CGFloat)value
    {
        if (!changeBrightnessQueue)
        {
            changeBrightnessQueue = [[NSOperationQueue alloc] init];
            changeBrightnessQueue.maxConcurrentOperationCount = 1;
        }
        [changeBrightnessQueue cancelAllOperations];
        
        CGFloat brightness = [UIScreen mainScreen].brightness;
        CGFloat stride = GRADUAL_STRIDE * ((value > brightness) ? 1 : -1);
        NSInteger times = fabs((value - brightness) / GRADUAL_STRIDE);
        for (NSInteger i = 1; i <= times; i++)
        {
            [changeBrightnessQueue addOperationWithBlock:^{
                
                [NSThread sleepForTimeInterval:1 / 180.0];
                [UIScreen mainScreen].brightness = brightness + i * stride;
            }];
        }
    }


    #pragma mark -- 逐步恢复亮度
    + (void)syResumeBrightness
    {
        [self syConfigBrightness:defaultBrightness];
    }