Some Notes on learning iOS development

About the +-symbol before the method

The preceding plus (+) method is a class method, which can be called directly with the class name, and it is primarily a function of creating an instance. Equivalent to a static method.

The preceding minus (-) method is an instance method that must be used by an instance of the class to invoke.

To declare a member variable static, you must use the static keyword


On the parameter problems of the function of Ob-c

A method of object-c can contain more than one parameter, except for the first argument, and all subsequent arguments are written with a name.
How to do multiple parameters

(The data type of the method) function name: (parameter 1 data type) parameter 1 of the numeric value of the first name of parameter 2: (Parameter 2 data type) parameter 2 value name ...;

As an example, the definition of a method:

-(void) Setkids: (NSString *) myoldestkidname secondkid: (NSString *) mysecondoldestkidname thirdkid: (NSString *) MyThird Oldestkidname;

When implementing this function:

-(void) Setkids: (NSString *) myoldestkidname secondkid: (NSString *) mysecondoldestkidname thirdkid: (NSString *) MyThird oldestkidname{

The older son = Myoldestkidname;

two sons = Mysecondoldestkidname;

three sons = Mythirdoldestkidname;

}

When called:

Kids *mykids = [[Kids alloc] init];

[Mykids setkids: @ "Zhang vigorously" secondkid: @ "Zhang Yili" Thirdkid: @ "Zhang Xiao Li"];

And if you write this method in C #, the general wording might be

public void Setkids (string myoldestkidname, String mysecondoldestkidname, String mythirdoldestkidname)

{

...

}

The approximate wording of the call might be:

Kids mykids = new Kids ();

Mykids.setkids ("Zhang vigorously", "Zhang Yili", "Zhang Xiao Li");

Do you understand? It's not really ugly.

Basically, if you can understand the conversion relationship of the following code, your OBJECTIVE-C syntax will understand 80%:

[[[[MyClass alloc] Init:[foo Bar]] autorelease];

The syntax for converting to C # or Java is:

Myclass.alloc (). Init (Foo.bar ()). Autorelease ();

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Some Notes on learning iOS development