OBJECTC----convenience constructors and specified initialization

creat by Guo Chai March 30, 2015 16:33:12

Specifies that the initialization method is an overload of the Init method implementation of the parent class, and it is not necessary to declare it in the. m file, which is called by other methods in this class.

Implementation of the method:

-(Instancetype) init

{

if (self = [super init])///can also self = [self init] to be called by other methods (init methods) in this class. Here self executes the pair//image of the method

{

Variable initialization in this class

}

return self;

}

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Convenience constructor: Is a class method that encapsulates the Alloc and Init methods, which is more convenient to use.

For example:

+ (ID) Vnherowithblood: (int) blood
{
Vnhero *hero = [[Vnhero alloc] init];
[Hero setvnheroblood:blood];//called Setter method
return hero; This is not the self of the past.
}

Main function declaration:

Invoke Convenience Builder

Vnhero * vn = [Vnhero vnherowithblood:67];

NSLog (@ "blood =%i", [vn blood]);

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OBJECTC----convenience constructors and specifying initialization