Dark Horse programmer--oc Language learning experience--attribute declaration and assignment

Dark Horse Programmer--oc Language learning experience-- attribute declarations and Assignments

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1, all classes in OC inherit from the ultimate parent class object
2, the declaration of a character variable with n is a string  *_xxx instance variable, usually preceded by an underscore
3, in OC, the method is distinguished by the +-number- The number beginning with the instance method or object method   + is the class method    pre-used object called by the latter with the class name called

5, Property assignment is available. The way or the pointer is assigned to the value

2. @interface Person:nsobject
3. {
4. int _pid;
5. NSString *_name;
6. int _age;
7. NSString *_email;
8. NSString *_address;
10. }
11. Get Set method
12. -(void) Setpid: (int) PID;
13. -(int) returnpid;
16. A simple method to implement the method of attribute declaration automatically Setget
17. @property (nonatomic) int pid;//nonatomic represents non-atomic, non-thread-safe atomic represents thread safety
18. @property NSString *name;
19. @property int age;
20. @property NSString *email;
21. @property NSString *address;
23. @end

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1. @implementation person
3. Assign value
4. -(void) Setpid: (int) pid{
5. Access by pointer
6. self->_pid=pid;
7. }
8. Take value
9. -(int) returnpid{
11. Wrong wording Self->return PID
12. Return self->_pid;
13. }
15. The implementation of the property is then used directly. Call
16. @synthesize Name=_name;
17. @synthesize Age=_age;
18. @synthesize Email=_email;
19. @synthesize address=_address;

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2. #import <Foundation/Foundation.h>
4. #import "Person.h"
6. #import "Person+ext.h"
8. int main (int argc, const char * argv[]) {
10. @autoreleasepool {
12. Insert code here ...
14. NSLog (@ "First function!!");
16. Create an instance
18. Person *per=[[person Alloc]init];
20. Call yourself to write the Setpid method to assign a value
22. [Per setpid:1234567];
24. Call the value method Returnpid return the new value
26. int Pid=[per Returnpid];
28. NSLog (@ "pid=%d", PID);
34. Use the. Call implementation to assign a value
38. [Email protected] "Zhinzik";
40. per.age=20;
42. [Email protected] "xxxxxxx";
44. [Email protected] "Chengdu";
48. Using the. Call implementation value '
50. NSString *name=per.name;
52. int age=per.age;
54. NSString *email=per.email;
56. NSString *address=per.address;
60. NSLog (@ "%@\n%d\n%@\n%@", name,age,email,address);
64. [Per Test];
68. }
70. return 0;
72. }

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Dark Horse programmer--oc Language learning experience--attribute declaration and assignment