iOS开发中对状态栏的操作比较少，因为状态栏是系统级别的View，是受苹果保护的，不可以随便更改，不可以随便遮挡住。
iOS开发中最常见的对状态栏的操作就是
设置状态栏的样式，比如： [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];（此样式的状态栏中的字为白色，所以用在导航栏为深色的情况下，例如黑色或者红色的导航栏）
还有
```
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];
```
（此样式的状态栏中的字为黑色色，所以用在导航栏为浅色色的情况下，比如白色的导航栏）
如果你设置了，发现状态栏没反应，那么你要去info.plist中加一个key，这个key为View controller-based status bar appearance，对应的value为NO。这样每个vc中就可以随便设置状态栏的样式了。
那么实际上我们可以拿到状态栏这个UIView对象。为了不让苹果看到我们用了某某私有API，我们这样做：
- (UIView*)statusBarView;
{
UIView*statusBar =nil;
NSData*data = [NSDatadataWithBytes:(unsignedchar[]){0x73,0x74,0x61,0x74,0x75,0x73,0x42,0x61,0x72}length:9];
NSString*key = [[NSStringalloc]initWithData:dataencoding:NSASCIIStringEncoding];
idobject = [UIApplicationsharedApplication];
if([objectrespondsToSelector:NSSelectorFromString(key)]) statusBar = [objectvalueForKey:key];
returnstatusBar;
}
调用这个方法就可以拿到系统的状态栏对象，是个UIView，那么UIView我们最熟悉了，我们可以改变状态栏的颜色，大小位置（frame）等等。
下面我们要从状态栏中获取我们想要的信息
定义一个工具类StatusBarTool，用来获取网络类型，运营商，电池电量，显示的系统时间等信息。那么直接看代码：
.h文件
#import < Foundation/Foundation.h >
#import < UIKit/UIKit.h >
//0 - 无网络 ; 1 - 2G ; 2 - 3G ; 3 - 4G ; 5 - WIFI
typedef NS_ENUM(NSUInteger, NetWorkType) {
NetWorkTypeNone=0,
NetWorkType2G=1,
NetWorkType3G=2,
NetWorkType4G=3,
NetWorkTypeWiFI=5,
};
@interface StatusBarTool : NSObject
/**
* @return 当前网络类型
*/
+(NetWorkType )currentNetworkType;
/**
* @return SIM卡所属的运营商（公司）
*/
+(NSString *)serviceCompany;
/**
* @return 当前电池电量百分比
*/
+(NSString *)currentBatteryPercent;
/**
* @return 当前时间显示的字符串
*/
+(NSString *)currentTimeString;
@end
.m实现文件（很重要）
#import “StatusBarTool.h”
@ implementation StatusBarTool
+(NSString *)currentBatteryPercent{
NSArray *infoArray = [[[[UIApplication sharedApplication] valueForKeyPath:@”statusBar”] valueForKeyPath:@”foregroundView”] subviews];
for (id info in infoArray)
{
if ([info isKindOfClass:NSClassFromString(@”UIStatusBarBatteryPercentItemView”)])
{
NSString *percentString = [info valueForKeyPath:@”percentString”];
NSLog(@”电量为：%@”,percentString);
return percentString;
}
}
return @”“;
}
+(NetWorkType )currentNetworkType{
NSArray *infoArray = [[[[UIApplication sharedApplication] valueForKeyPath:@”statusBar”] valueForKeyPath:@”foregroundView”] subviews];
NetWorkType type;
for (id info in infoArray)
{
if ([info isKindOfClass:NSClassFromString(@”UIStatusBarDataNetworkItemView”)]) {
type = [[info valueForKeyPath:@”dataNetworkType”] integerValue];
NSLog(@”—-%lu”, (unsigned long)type);
return (NetWorkType)type;
}
}
return NetWorkTypeNone;
}
+(NSString *)currentTimeString{
NSArray *infoArray = [[[[UIApplication sharedApplication] valueForKeyPath:@”statusBar”] valueForKeyPath:@”foregroundView”] subviews];
for (id info in infoArray)
{
if ([info isKindOfClass:NSClassFromString(@”UIStatusBarTimeItemView”)])
{
NSString *timeString = [info valueForKeyPath:@”timeString”];
NSLog(@”当前显示时间为：%@”,timeString);
return timeString;
}
}
return @”“;
}
+(NSString *)serviceCompany{
NSArray *infoArray = [[[[UIApplication sharedApplication] valueForKeyPath:@”statusBar”] valueForKeyPath:@”foregroundView”] subviews];
for (id info in infoArray)
{
if ([info isKindOfClass:NSClassFromString(@”UIStatusBarServiceItemView”)])
{
NSString *serviceString = [info valueForKeyPath:@”serviceString”];
NSLog(@”公司为：%@”,serviceString);
return serviceString;
}
}
return @”“;
}
@end
用StatusBarTool这个类的时候
NSString *company = [StatusBarTool serviceCompany];
NSLog(@”company = %@”,company);
company = 中国移动
NetWorkType type = [StatusBarTool currentNetworkType];
NSLog(@”type = %ld”,type);
type = 5（5代表Wi-Fi）
／＊typedef NS_ENUM(NSUInteger, NetWorkType) {
NetWorkTypeNone=0,
NetWorkType2G=1,
NetWorkType3G=2,
NetWorkType4G=3,
NetWorkTypeWiFI=5,
};＊／
NSString *batteryPercent = [StatusBarTool currentBatteryPercent];
NSLog(@”batteryPercent = %@”,batteryPercent);
batteryPercent �� = 96%
NSString *timeString = [StatusBarTool currentTimeString];
NSLog(@”timeString = %@”,timeString);
timeString = 12:57
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