pass two arguments with performSelector method

Question

-(void)application :(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{

    [self addMessageFromRemoteNotification:userInfo updateUI:NO];

}

I need to run above method in performSelectorInBackground method.but there is option with single object.How do i change my code?

I believe this is what you're looking for as a reference: http://stackoverflow.com/questions/8439052/ios-how-to-implement-a-performselector-with-multiple-arguments-and-with-afterd — Jai Govindani, Mar 27 '13 at 11:15

score 2 · Answer 1 · answered Mar 27 '13 at 11:16

use GCD:

-(void)application :(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        [self addMessageFromRemoteNotification:userInfo updateUI:NO];
    });

}

dispatch_async returns immediately, and then the block will execute asynchronously in the background.

score 2 · Answer 2 · answered Mar 27 '13 at 11:26

There is no way to pass multiple parameters via performSelectorInBackground. The way I solve the issue when I encounter it is passing a dictionay, this is made easier with the literal NSDictionary syntax.

-(void)application :(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    [self performSelectorInBackground:@selector(backgroundMethod:) withObject:@{@"userInfo" : someUserInfoDictionary, @"updateUI" : @(NO)}];
}
-(void)backgroundMethod:(NSDictionary *)params
{
    [self addMessageFromRemoteNotification:params[@"userInfo"] updateUI:[params[@"updateUI"] boolValue]];
}

[self performSelectorInBackground:@selector(backgroundMethod:) withObject:@{@"userInfo" : userInfo, @"updateUI" : @(NO)}]; — user2134883, Mar 28 '13 at 06:08

pass two arguments with performSelector method

2 Answers2