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。如果违反这些苹果的规范，那么APP将有可能上不了架。笔者就曾写过一个APP，因状态栏被提示框遮挡而杯具（被拒）了。 一、操作状态栏的样式 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：

//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
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];//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
[[UIApplication sharedApplication]setStatusBarStyle:UIStatusBarStyleDefault];复制代码

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。

二、操作状态栏的大小、背景颜色、位置 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 = [NSData dataWithBytes:(unsigned char []){0x73, 0x74, 0x61, 0x74, 0x75, 0x73, 0x42, 0x61, 0x72} length:9];NSString *key = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; id object = [UIApplication sharedApplication]; if ([object respondsToSelector:NSSelectorFromString(key)]) statusBar = [object valueForKey:key]; return statusBar;
}
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调用这个方法就可以拿到系统的状态栏对象，是个UIView类型的对象，那么UIView我们最熟悉了，我们可以改变状态栏的颜色，背景颜色（backgroundColor）、大小位置（frame）等等。

三、操作状态栏，得到网络类型、运营商、电池电量等 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
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.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#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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四、获取WiFi信号强度

虽然各种直接获取信号强度的api都被封杀了。但是还有一个另类的黑魔法可以获取到。那就是遍历UIStatusBar了（注意：Wi-Fi列表和列表中的Wi-Fi信号强度是获取不到的，只能得到自己当前iPhone链接的Wi-Fi的名字和对应的Wi-Fi信号强度。） 另外：不要留言说，1、博主，我想问一下，人家万能钥匙怎么实现的呢？ 2、不对，博主，AppStore上面很多app都可以获取到WiFi列表。请问怎么实现的？ 看下面的代码

- (int )getSignalStrength{UIApplication *app = [UIApplication sharedApplication];NSArray *subviews = [[[app valueForKey:@"statusBar"] valueForKey:@"foregroundView"] subviews];UIView *dataNetworkItemView = nil;for (UIView * subview in subviews) {if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {dataNetworkItemView = subview;break;}}int signalStrength = [[dataNetworkItemView valueForKey:@"_wifiStrengthBars"] intValue];NSLog(@"signal %d", signalStrength);return signalStrength;
}
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五、获取WiFi的名称，IP地址 WiFi的名称就是WiFi的SSID，也就是我们看到列表中的WiFi的名字。 首先我们要导入三个相关的头文件，代码如下：

#import <SystemConfiguration/CaptiveNetwork.h>
#import <ifaddrs.h>
#import <arpa/inet.h>- (NSString *)getIPAddress{NSString *address = @"error";struct ifaddrs *interfaces = NULL;struct ifaddrs *temp_addr = NULL;int success = 0;// retrieve the current interfaces - returns 0 on successsuccess = getifaddrs(&interfaces);if (success == 0) {// Loop through linked list of interfacestemp_addr = interfaces;while (temp_addr != NULL) {if( temp_addr->ifa_addr->sa_family == AF_INET) {// Check if interface is en0 which is the wifi connection on the iPhoneif ([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {// Get NSString from C Stringaddress = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];}}temp_addr = temp_addr->ifa_next;}}// Free memoryfreeifaddrs(interfaces);return address;
}
-(NSString *)getWifiName{NSString *wifiName = nil;CFArrayRef wifiInterfaces = CNCopySupportedInterfaces();if (!wifiInterfaces) {return nil;}NSArray *interfaces = (__bridge NSArray *)wifiInterfaces;for (NSString *interfaceName in interfaces) {CFDictionaryRef dictRef = CNCopyCurrentNetworkInfo((__bridge CFStringRef)(interfaceName));if (dictRef) {NSDictionary *networkInfo = (__bridge NSDictionary *)dictRef;NSLog(@"network info -> %@", networkInfo);wifiName = [networkInfo objectForKey:(__bridge NSString *)kCNNetworkInfoKeySSID];CFRelease(dictRef);}}CFRelease(wifiInterfaces);return wifiName;
}
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好了，至此我们已经拿到了网络状态，WiFi信号强度，WiFi名字和IP地址，运营商，电池电量百分比，时间显示等信息了。其实遍历UIStatusBar还可以获取到其他的有用信息，这里就不一一列举了，只列举了常用的。

原文转自：http://blog.csdn.net/wenmingzheng/article/details/50475671