[Objective-C] 010_Foundation框架之NSSet与NSMutableSet

在Cocoa Foundation中的NSSet和NSMutableSet ，和NSArray功能性质一样，用于存储对象属于集合。但是NSSet和NSMutableSet是无序的, 保证数据的唯一性，当插入相同的数据时，不会有任何效果。

NSSet 初始化及常用操作

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    NSSet *students = [NSSet setWithObjects:@"小明", @"小辉", @"大雄", nil];
    NSSet *teachers = [[NSSet alloc] initWithObjects:@"校长", @"副校长", @"政教主任", nil];
    NSArray *array = [NSArray arrayWithObjects:@"小明", @"小辉", @"大雄",@"小李", nil];
    NSSet *students_2 = [NSSet setWithArray:array];
    
    NSLog(@"students :%@", students);
    NSLog(@"teachers :%@", teachers);
    NSLog(@"students_2 :%@", students_2);
    
    //获取集合students包含对象的个数
    NSLog(@"students count :%lu", (unsigned long)students.count);
    
    //以数组的形式获取集合teachers中的所有对象
    NSArray *allTeacher = [teachers allObjects];
    NSLog(@"allObj :%@", allTeacher);
    
    //获取teachers中任意一对象
    NSLog(@"anyObj :%@", [teachers anyObject]);
    
    //teachers是否包含某个对象
    if ([teachers containsObject:@"副校长"]) {
        NSLog(@"teachers中有副校长");
    }
    
    //是否包含指定set中的对象
    if ([students_2 intersectsSet:students]) {
        NSLog(@"intersects");
    }
    
    //是否完全匹配
    if ([students_2 isEqualToSet:students]) {
        NSLog(@"完全匹配");
    }else{
        NSLog(@"完全匹配？ NO。。。。。。。");
    }
    
    //是否是子集合
    if ([students isSubsetOfSet:students_2]) {
        NSLog(@"students isSubsetOf students_2");
    }
    
    //迭代器遍历
    NSEnumerator *enumerator = [teachers objectEnumerator];
    NSObject *teacher  = [enumerator nextObject];
    while (teacher != nil) {
        NSLog(@"teachers中的数据: %@",teacher);
        teacher = [enumerator nextObject];
    }
    
    //快速枚举遍历
    for (NSObject *teacher in teachers) {
        NSLog(@"teachers中的数据: %@",teacher);
    }
    
    return YES;
}

@end

NSMutableSet 初始化及常用操作

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    NSMutableSet *mutableStudent = [NSMutableSet setWithObjects:@"F1", @"F2", @"F3", nil];
    NSMutableSet *mutableTeacher = [NSMutableSet setWithObjects:@"B1", @"B2", @"B3", nil];
    NSMutableSet *mutableStudent2 = [NSMutableSet setWithObjects:@"F1", @"F2", @"F3",@"F4", nil];
    
    //集合元素相减
    [mutableStudent2 minusSet:mutableStudent];
    NSLog(@"mutableStudent2 minus mutableStudent:%@", mutableStudent2);
    
    //mutableStudent2只留下相等元素
    [mutableStudent intersectSet:mutableStudent2];
    NSLog(@"intersect :%@", mutableStudent2);
    
    //mutableStudent合并集合
    [mutableStudent unionSet:mutableStudent2];
    NSLog(@"union :%@", mutableStudent);
    
    //mutableTeacher删除指定元素
    [mutableTeacher removeObject:@"好色仙人"];
    NSLog(@"removeObj :%@", mutableTeacher);
    
    //mutableTeacher删除所有数据
    [mutableTeacher removeAllObjects];
    NSLog(@"removeAll :%@", mutableTeacher);
    
    return YES;
}

@end

 

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