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POhow sending message to class works in objective-c
 

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  1. POhow sending message to class works in objective-c
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    <p>I am trying to find out how method calls works in objective-c.</p> <p>I have a simple line of code in an iPhone app, wich is changing the appearance of a view, and then a view controller is called and attached to the main view.</p> <pre><code>switch(pressed) { case overall: { IPViewController *ipv = [[IPViewController alloc] initWithParam:(IPParam*)p]; [self.view addSubview: ipv.view]; [ipCustomTabbar switchOn:YES]; // &lt;-- here at first attempt } } </code></pre> <p>It happens that the allocation of ipv is quite time consuming, so the appearance of the ipCustomTabbar get changed after a bit. So I decided to move the ipCustomTabbar at first. But with my surprise I found that that the behaviour is not changed at all. The ipCustomTabbar is not changed until the ipv is initialized and attached to view. I was expecting that the first thing was a call/message on switchOn then execute the rest of the flow.</p> <pre><code>switch(pressed) { case overall: { [ipCustomTabbar switchOn:YES]; // &lt;-- moved here IPViewController *ipv = [[IPViewController alloc] initWithParam:(IPParam*)p]; [self.view addSubview: ipv.view]; } } </code></pre> <p>EDIT: if I comment out the "time-consuming" lines everything is quite fast.</p> <pre><code>switch(pressed) { case overall: { [ipCustomTabbar switchOn:YES]; // &lt;-- only this is fast //IPViewController *ipv = [[IPViewController alloc] initWithParam:(IPParam*)p]; //[self.view addSubview: ipv.view]; } } </code></pre> <p>What am I missing here ?</p> <p>thanks</p>
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    1. USLeonardo
    1. USLeonardo
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    1. CONormally alloc don't take much time. Please post your initWithParam code.
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      1. UStaskinoor
    2. COThanks. But the problem is not with alloc, or init, I already know it takes some time to complete, and it's ok because it has to iterate and parse a few datas. What I was wondering is why the ipCustomTabbar will wait in any case for initWithParameter to complete.
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      1. USLeonardo
    3. COWhy it won't wait? they are running in same thread and obviously your initWithParam is blocking call, assuming you are not detaching another thread from init. Isn't it?
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