iOS常用代码片段

记录 iOS 常用代码片段。

判断当前网络状态 Demo

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
/** 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. didFinishLaunchingWithOptions: 保存默认亮度值。

    1
    2
    3
    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:NO]
    forKey:IS_NEED_CHANGE_BRIGHTNESS];
    [GradualBrightness sySaveDefaultBrightness];
  2. applicationWillResignActive: 恢复默认亮度值(如果需要)。

    1
    2
    3
    4
    5
    6
    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
    BOOL isNeedChangeBrightness = [[userDefault objectForKey:IS_NEED_CHANGE_BRIGHTNESS] boolValue];
    if (YES == isNeedChangeBrightness)
    {
    [GradualBrightness syResumeBrightness];
    }
  3. applicationDidBecomeActive: 设定新亮度值(如果需要)。

    1
    2
    3
    4
    5
    6
    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
    BOOL isNeedChangeBrightness = [[userDefault objectForKey:IS_NEED_CHANGE_BRIGHTNESS] boolValue];
    if (YES == isNeedChangeBrightness)
    {
    [GradualBrightness syConfigBrightness:CUSTOM_BRIGHTNESS_VAULE];
    }
  4. viewWillAppear: 设定新亮度值(同时设为需要)。

    1
    2
    3
    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:YES]
    forKey:IS_NEED_CHANGE_BRIGHTNESS];
    [GradualBrightness syConfigBrightness:CUSTOM_BRIGHTNESS_VAULE];
  5. viewWillDisappear: 恢复默认亮度值(同时设为不需要)。

    1
    2
    3
    [GradualBrightness syResumeBrightness];
    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:NO]
    forKey:IS_NEED_CHANGE_BRIGHTNESS];
  6. 实现代码

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    /** 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];
    }
------ 本文结束 ------
欣赏此文?求鼓励,求支持!