本文指出在对象初始化过程中常见的几个误区，包括未分配内存直接初始化、声明非指针类型的对象及未在初始化方法中调用父类初始化等。这些问题在实际编程中容易被忽视，但可能导致程序运行时出现不可预料的问题。
转自：http://stackoverflow.com/questions/8815200/receiver-type-for-instance-message-is-a-forward-declaration
You're -init'ing an object without +alloc'ing it. That won't work You're declaring an object as a non-pointer type, that won't work either You're not calling [super init] in -init.
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