会合、可变集合

集合、可变集合

<pre name="code" class="objc">int main(int argc, const char * argv[]) {
    @autoreleasepool {
        //        4 NSArray -> NSSet
        NSArray * array = @[@"one",@"two",@"three"];
        NSSet * set = [NSSet setWithArray:array];
        
        NSLog(@"%@",set);
//        5 NSDictionary -> NSArray
        NSDictionary * dic = @{
                               @"name":@"Jack",
                               @"age":@"18",
                               @"ID":@"1001"
                               };
        NSArray * keysArray = [dic allKeys];

        NSArray * valuesArray = [dic allValues];
        
        //6 字符串转换成数组
          // 创建字符串
        NSString * str = @"I am studying ";
        // 传入字符参数分割字符串
        NSArray * arrStr = [str componentsSeparatedByString:@"am"];
        NSLog(@"arrStr %@",arrStr);
    }
    return 0;
}

#import <Foundation/Foundation.h>int main(int argc, const char * argv[]) { @autoreleasepool { NSSet * set = [[NSSet alloc] initWithObjects:@"one",@"two",@"three",@"four",@"one", nil]; NSLog(@"%@",set); NSCountedSet// NSSet中不能够存储重复的数据 NSUInteger count = [set count]; NSLog(@"coutn %lu",count); BOOL isContain = [set containsObject:@"t"]; if (isContain) { NSLog(@"contain"); } else { NSLog(@"not contain"); } } return 0;}

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSMutableSet * set = [[NSMutableSet alloc] initWithObjects:@"one",@"two", nil];
        NSLog(@"%@",set);
        // 增加值
        [set addObject:@"three"];
        NSLog(@"%@",set);
        // 删除值
        [set removeObject:@"two"];
        NSLog(@"%@",set);
        // 删除所有
        [set removeAllObjects];
        NSLog(@"%@",set);
        
    }
    return 0;
}