NSDictionary基础-创建、初始化、赋值、获取、复制

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
@autoreleasepool {
//创建字典
NSNumber *num=[NSNumber numberWithInt:100];
NSDictionary *dic1=[NSDictionary dictionaryWithObject:num forKey:@"money"];
NSLog(@"%@",dic1);
//同时传入多个值,依次是value,key,value,key...
NSDictionary *dic2=[NSDictionary dictionaryWithObjectsAndKeys:@"Jay",@"name",@"22",@"age",@"Female",@"Sex",nil];
NSLog(@"%@",dic2);
//直接赋值
NSDictionary *dic3=@{@"name":@"White",
@"age":@"22",
@"sex":@"Male"};
NSLog(@"%@",dic3);
//复制字典
NSDictionary *dic4=[NSDictionary dictionaryWithDictionary:dic3];
//获取key-value的对数
NSUInteger count=[dic4 count];
NSLog(@"count=%ld",count);
//根据key获取value
NSString *name=[dic3 objectForKey:@"name"];
NSLog(@"%@",name);
//获取字典中所有value
NSArray *arr1=[dic3 allValues];
NSLog(@"%@",arr1);
//获取字典中所有key
NSArray *arr2=[dic3 allKeys];
NSLog(@"%@",arr2);
}
return 0;
}