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出现了标题的错误

查了一通，内存管理的问题


http://stackoverflow/questions/9286782/potential-leak-of-an-object-allocated-and-stored-into-annot


https://developer.apple/library/mac/#documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmRules.html


这个例子很好：


You could also implement the fullName method like this:

- (NSString *)fullName {
    NSString *string = [NSString stringWithFormat:@"%@ %@",
                                 self.firstName, self.lastName];
    return string;
}

Following the basic rules, you don’t own the string returned by stringWithFormat:, so you can safely return the string from the method.

By way of contrast, the following implementation is wrong:

- (NSString *)fullName {
    NSString *string = [[NSString alloc] initWithFormat:@"%@ %@",
                                         self.firstName, self.lastName];
    return string;
}






本文标签： leak potential object stored allocated

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