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    <p>First off, I wanted to promote the comment from David Gelhar to a full answer. The modifiers <code>atomic</code> and <code>nonatomic</code> have nothing to do with thread safety. See <a href="https://stackoverflow.com/questions/588866/atomic-vs-nonatomic-properties">this question</a> for more detail in that space.</p> <p>The other items you listed can be addressed relatively simply. I'll hit them briefly and point you toward the <a href="http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Articles/ocProperties.html#//apple_ref/doc/uid/TP30001163-CH17-SW1" rel="nofollow noreferrer">documentation</a> on property modifiers if you want more.</p> <p><code>atomic</code> vs <code>nonatomic</code> primarily ensures that complete values are returned from synthesized getters and that complete values are written by synthesized setters.</p> <p><code>readwrite</code> vs <code>readonly</code> determines whether a synthesized property has a synthesized accessor or not (<code>readwrite</code> has a setter and is the default, <code>readonly</code> does not).</p> <p><code>assign</code> vs <code>retain</code> vs <code>copy</code> determines how the synthesized accessors interact with the Objective-C memory management scheme. <code>assign</code> is the default and simply performs a variable assignment. <code>retain</code> specifies the new value should be sent <code>-retain</code> on assignment and the old value sent <code>-release</code>. <code>copy</code> specifies the new value should be sent <code>-copy</code> on assignment and the old value sent <code>-release</code>.</p>
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    1. POHow to use properties in Objective-C?
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    1. USDavid Schaefgen
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    1. COAlso, care needs to be taken to use the setters and getters of the ivar, and not change the ivar directly, which circumvents the setters and getters. That is, use self.myValue = newValue, not myValue = newValue.
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      1. USHack Saw
    2. COAbsolutely, regarding the use of `self.myValue = newValue` vs `myValue=newValue`. If you are going to use properties, you need to make sure you use dot syntax or send the messages to self. Accessing the ivar directly would undermine quite a bit.
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