KVC鍵值編碼，使用完整實例：
#import <Foundation/Foundation.h>
@interface Course : NSObject
{
NSString* courseName;
}
- (NSString*)description;
@end
#import "Course.h"
@implementation Course
- (NSString*)description
{
NSString* str = [NSString stringWithFormat:@"%@",courseName];
return str;
}
@end
#import <Foundation/Foundation.h>
#import "Course.h"
@interface Student : NSObject
{
NSString* name;
Course* course;
NSInteger point;
NSArray* otherStudent;
}
- (NSString*)description;
@end
#import "Student.h"
@implementation Student
- (NSString*)description
{
NSString* str = [NSString stringWithFormat:@"name is %@,course is %@,point is %lu",name,course,point];
return str;
}
@end
#import <Foundation/Foundation.h>
#import "Student.h"
#import "Course.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
//使用KVC存儲屬性值，
//方式一
Student* student1 = [[[Student alloc] init] autorelease];
Course* course1 = [[[Course alloc] init] autorelease];
[student1 setValue:@"wusong" forKey:@"name"];
[student1 setValue:@"90" forKey:@"point"];
[course1 setValue:@"yuwen" forKey:@"courseName"];
[student1 setValue:course1 forKey:@"course"];
//方式二
Student* student2 = [[[Student alloc] init] autorelease];
Course* course2 = [[[Course alloc] init] autorelease];
[student2 setValue:@"liyang" forKey:@"name"];
[student2 setValue:course2 forKey:@"course"];
[student2 setValue:@"shuxue" forKeyPath:@"course.courseName"];
//自動封裝基本數據類型
[student2 setValue:@"88" forKey:@"point"];
//定義三個學生，存放到數組中，求三個學生成績的最大值，最小值，平均值
Student* student = [[[Student alloc] init] autorelease];
Course* course = [[[Course alloc] init] autorelease];
[student setValue:@"wusong" forKey:@"name"];
[student setValue:course forKey:@"course"];
[student setValue:@"shuxue" forKeyPath:@"course.courseName"];
Student* stu1 = [[[Student alloc] init] autorelease];
Student* stu2 = [[[Student alloc] init] autorelease];
Student* stu3 = [[[Student alloc] init] autorelease];
[stu1 setValue:@"88" forKey:@"point"];
[stu2 setValue:@"70" forKey:@"point"];
[stu3 setValue:@"91" forKey:@"point"];
NSArray* array = [NSArray arrayWithObjects:stu1,stu2,stu3, nil];
[student setValue:array forKey:@"otherStudent"];
NSLog(@"其他學生的成績%@",[student valueForKeyPath:@"otherStudent.point"]);
NSLog(@"共有%@個學生",[student valueForKeyPath:@"otherStudent.@count"]);
NSLog(@"最高成績爲%@",[student valueForKeyPath:@"[email protected]"]);
NSLog(@"最低成績爲%@",[student valueForKeyPath:@"[email protected]"]);
NSLog(@"平均成績爲%@",[student valueForKeyPath:@"[email protected]"]);
}
return 0;
}
Block語句塊
//當在BLock語句塊外的變量用__block聲明時，在Block語句塊中此變量纔可以被修改
__block int num = 10;
void(^myBlock)(int n1,int n2) = ^(int num1,int num2){
NSLog(@"%d,%d",num1,num2);
num++;
NSLog(@"%d",num);
};
myBlock(1,2);//調用
//使用Block語法來對數組中的元素進行排序和枚舉訪問數組中的元素，步驟爲：
NSArray* array = [NSArray arrayWithObjects:@"string1",@"string12",@"string21",@"string01",nil];
NSComparator comparator = ^(id obj1,id obj2){
return [obj1 compare:obj2];
};
NSArray* array1 = [array sortedArrayUsingComparator:comparator];
NSLog(@"array1:%@",array1);
//枚舉，逐一去訪問元素
[array1 enumerateObjectsUsingBlock:^(id obj,NSUInteger index,BOOL* stop){
NSLog(@"%@",obj);
NSLog(@"%lu",index);
}];