iOS开发之widget实现详解

- (void)openURLContainingAPP{
 //通过extensionContext借助host app调起app
 [self.extensionContext openURL:[NSURL URLWithString:@"appextension://xxx"] completionHandler:^(BOOL success) { 
 NSLog(@"open url result:%d",success); 
 }];
}

- (void)saveDataByNSUserDefaults{ 
 NSUserDefaults *shared = [[NSUserDefaults alloc] initWithSuiteName:@"group.c
om.xxx"];
 [shared setObject:@"asdfasdf" forKey:@"widget"]; 
 [shared synchronize];
}

- (NSString *)readDataFromNSUserDefaults{ 
 NSUserDefaults *shared = [[NSUserDefaults alloc] initWithSuiteName:@"group.c
om.xxx"]; 
 NSString *value = [shared valueForKey:@"widget"]; 
 return value;
}

- (BOOL)saveDataByNSFileManager{ 
 NSError *err = nil; 
 NSURL *containerURL = [[NSFileManager defaultManager] containerURLForSecuri
tyApplicationGroupIdentifier:@"group.com.xxx"]; 
 containerURL = [containerURL URLByAppendingPathComponent:@"Library/Caches/
widget"]; 
 NSString *value = @"asdfasdfasf"; 
 BOOL result = [value writeToURL:containerURL atomically:YES encoding:NSUTF8StringEncoding error:&err];
 if (!result) { 
 NSLog(@"%@",err); 
 } else { 
 NSLog(@"save value:%@ success.",value); 
 } 
 return result;
}

- (NSString *)readDataByNSFileManager{ 
 NSError *err = nil;
 NSURL *containerURL = [[NSFileManager defaultManager] containerURLForSecuri
tyApplicationGroupIdentifier:@"group.com.xxx"]; 
 containerURL = [containerURL URLByAppendingPathComponent:@"Library/Caches/
widget"]; 
 NSString *value = [NSString stringWithContentsOfURL:containerURL encoding:
NSUTF8StringEncoding error:&err]; 
 return value;
}