iOS開發(fā)中對(duì)狀態(tài)欄的操作比較少属拾，因?yàn)闋顟B(tài)欄是系統(tǒng)級(jí)別的View，是受蘋果保護(hù)的屋匕，不可以隨便更改，不可以隨便遮擋住借杰。
iOS開發(fā)中最常見的對(duì)狀態(tài)欄的操作就是
設(shè)置狀態(tài)欄的樣式过吻，比如： [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];（此樣式的狀態(tài)欄中的字為白色，所以用在導(dǎo)航欄為深色的情況下蔗衡，例如黑色或者紅色的導(dǎo)航欄）
還有
```
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];
```
（此樣式的狀態(tài)欄中的字為黑色色纤虽，所以用在導(dǎo)航欄為淺色色的情況下，比如白色的導(dǎo)航欄）
如果你設(shè)置了绞惦，發(fā)現(xiàn)狀態(tài)欄沒反應(yīng)逼纸，那么你要去info.plist中加一個(gè)key，這個(gè)key為View controller-based status bar appearance济蝉，對(duì)應(yīng)的value為NO杰刽。這樣每個(gè)vc中就可以隨便設(shè)置狀態(tài)欄的樣式了。
那么實(shí)際上我們可以拿到狀態(tài)欄這個(gè)UIView對(duì)象王滤。為了不讓蘋果看到我們用了某某私有API贺嫂，我們這樣做：
- (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;
}
調(diào)用這個(gè)方法就可以拿到系統(tǒng)的狀態(tài)欄對(duì)象，是個(gè)UIView雁乡，那么UIView我們最熟悉了第喳，我們可以改變狀態(tài)欄的顏色，大小位置（frame）等等踱稍。
下面我們要從狀態(tài)欄中獲取我們想要的信息
定義一個(gè)工具類StatusBarTool墩弯，用來獲取網(wǎng)絡(luò)類型，運(yùn)營商寞射，電池電量渔工，顯示的系統(tǒng)時(shí)間等信息。那么直接看代碼：
.h文件
#import < Foundation/Foundation.h >
#import < UIKit/UIKit.h >
//0 - 無網(wǎng)絡(luò) ; 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 當(dāng)前網(wǎng)絡(luò)類型
*/
+(NetWorkType )currentNetworkType;
/**
* @return SIM卡所屬的運(yùn)營商（公司）
*/
+(NSString *)serviceCompany;
/**
* @return 當(dāng)前電池電量百分比
*/
+(NSString *)currentBatteryPercent;
/**
* @return 當(dāng)前時(shí)間顯示的字符串
*/
+(NSString *)currentTimeString;
@end
.m實(shí)現(xiàn)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(@”電量為：%@”,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(@”當(dāng)前顯示時(shí)間為：%@”,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(@”公司為：%@”,serviceString);
return serviceString;
}
}
return @”“;
}
@end
用StatusBarTool這個(gè)類的時(shí)候
NSString *company = [StatusBarTool serviceCompany];
NSLog(@”company = %@”,company);
company = 中國移動(dòng)
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
