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Isn’t it very clear in the book:

• _name = @"Jack" It is fast to directly assign values ??to variables without sending messages through setters.

• For the following name attributes:

@property (nonatomic, copy) NSString *name;

Direct assignment is: _name = @"Jack"; ，通過 self.name = @"Jack" 其實(shí)等同于 _name = @"Jack".copy;

• self.name = @"Jack" 會(huì)觸發(fā)KVO，_name = @"Jack" will trigger KVO,

  will not

• self.name = @"Jack"

  You can perform breakpoint debugging in the setter method, and you will know every assignment.

NSString *str = _name,賦值用 self.name = @"Jack"So there is a reasonable compromise solution, which is to use NSString *str = _name when reading data, and use

self.name = @"Jack"可能不等同于 _name = @"Jack".copyAnother thing to note is that subclasses may override setter methods, and using