博主:易飞扬
原文链接 : http://www.yifeiyang.net/iphone-web-development-skills-of-the-article-4-make-sure-the-network-environment-3gwifi/
转载请保留上面文字。
iPhone开发技巧之网络篇(4)--- 确认网络环境 3G/WIFI
开发Web等网络应用程序的时候,需要确认网络环境,连接情况等信息。如果没有处理它们,是不会通过Apple的审查的。
Reachability
Apple 的 例程
Reachability 中介绍了取得/检测网络状态的方法。在你的程序中使用 Reachability 只须将该例程中的 Reachability.h 和 Reachability.m 拷贝到你的工程中。如下图:
然后将 SystemConfiguration.framework 添加进工程:
Reachability 中定义了3种网络状态。
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| typedef enum {
NotReachable = 0,
ReachableViaCarrierDataNetwork,
ReachableViaWiFiNetwork
} NetworkStatus;
typedef enum {
NotReachable = 0,
ReachableViaWiFi,
ReachableViaWWAN
} NetworkStatus;
|
- NotReachable
无连接
- ReachableViaCarrierDataNetwork (ReachableViaWWAN)
使用3G/GPRS网络
- ReachableViaWiFiNetwork (ReachableViaWiFi)
使用WiFi网络
比如检测某一特定站点的接续状况,可以使用下面的代码:
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| Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”];
switch ([r currentReachabilityStatus]) {
case NotReachable:
break;
case ReachableViaWWAN:
break;
case ReachableViaWiFi:
break;
}
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检测当前网络环境
程序启动时,如果想检测可用的网络环境,可以像这样。
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| + (BOOL) IsEnableWIFI {
return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);
}
+ (BOOL) IsEnable3G {
return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable);
}
|
连接状态实时通知
网络连接状态的实时检查,通知在网络应用中也是十分必要的。接续状态发生变化时,需要及时地通知用户。由于Reachability1.5版与2.0版有一些变化,这里分开来说明使用方法。
Reachability 1.5
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|
#import "Reachability.h"
@interface MyAppDelegate : NSObject <UIApplicationDelegate> {
NetworkStatus remoteHostStatus;
}
@property NetworkStatus remoteHostStatus;
@end
#import "MyAppDelegate.h"
@implementation MyAppDelegate
@synthesize remoteHostStatus;
- (void)updateStatus {
self.remoteHostStatus = [[Reachability sharedReachability] remoteHostStatus];
}
- (void)reachabilityChanged:(NSNotification *)note {
[self updateStatus];
if (self.remoteHostStatus == NotReachable) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"AppName", nil) message:NSLocalizedString(@"NotReachable", nil)
delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];
[alert release];
}
}
- (void)applicationDidFinishLaunching:(UIApplication *)application {
[[Reachability sharedReachability] setHostName:@"www.apple.com"];
[[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:)
name:@"kNetworkReachabilityChangedNotification" object:nil];
[self updateStatus];
}
- (void)dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self];
[window release];
[super dealloc];
}
|
Reachability 2.0
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|
@class Reachability;
@interface MyAppDelegate : NSObject <UIApplicationDelegate> {
Reachability *hostReach;
}
@end
- (void)reachabilityChanged:(NSNotification *)note {
Reachability* curReach = [note object];
NSParameterAssert([curReach isKindOfClass: [Reachability class]]);
NetworkStatus status = [curReach currentReachabilityStatus];
if (status == NotReachable) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AppName""
message:@"NotReachable"
delegate:nil
cancelButtonTitle:@"YES" otherButtonTitles:nil];
[alert show];
[alert release];
}
}
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// ...
// 监测网络情况
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(reachabilityChanged:)
name: kReachabilityChangedNotification
object: nil];
hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"] retain];
[hostReach startNotifer];
// ...
}
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