适合有java和C基础的同学迅速了解OC
- #import <Foundation/Foundation.h>
- void testSet();
- void testDictionary();
-
- int main(int argc, const char * argv[])
- {
- NSAutoreleasePool *pool=[[NSAutoreleasePool alloc] init];
-
- testSet();
- NSLog(@"\n\n------------------------------\n\n");
- testDictionary();
-
- [pool drain];
- return 0;
- }
- void testDictionary()
- {
- // 此种方式创建集合对象，最后都要以nil结尾
- NSMutableDictionary *mdict=[NSMutableDictionary dictionaryWithObjectsAndKeys:
- @"James",@"name",
- [NSNumber numberWithInteger:20],@"age",
- @"1568956556",@"phoneNo",nil];
- [mdict setObject:[NSNumber numberWithFloat:66.6] forKey:@"weight"];
- [mdict removeObjectForKey:@"phoneNo"];
- // 根据key取value，没找到返回空
- NSLog(@"name=%@,age=%d,phontNo=%@,weight=%.2f",
- [mdict objectForKey:@"name"],
- [[mdict objectForKey:@"age"] intValue],
- [mdict objectForKey:@"phoneNo"],
- [[mdict objectForKey:@"weight"] doubleValue]);
-
- // @方式快速创建出来的都是不可变对象
- NSDictionary *dict=@{
- @"name":@"Bruce",
- @"age":[NSNumber numberWithLong:28],
- @"phoneNo":@"1868955656",
- @"weight":[NSNumber numberWithDouble:72.2]};
- NSLog(@"dict=%@",dict);
-
- // for循环方式遍历字典
- NSArray *keys=[mdict allKeys];
- int i;
- for(i=0;i<[mdict count];i++)
- {
- id<NSCopying> key = [keys objectAtIndex:i];
- id val = [mdict objectForKey:key];
- NSLog(@"%@=%@",key,val);
- }
- // 字典自身的利用block遍历方法
- [dict enumerateKeysAndObjectsUsingBlock:
- ^(id key,id obj,BOOL *stop)
- {
- NSLog(@"%@=%@",key,obj);
- }];
-
- }
- void testSet()
- {
- NSSet *set = [NSSet setWithObjects:@"123",@"123",@"222",
- [[[NSObject alloc] init] autorelease],@"333",@"444",@"222",nil];
- //Set中元素是无序且唯一
- NSLog(@"setCount=%d andSet=%@",[set count],set);
- // anyObject多次调用返回同一个值，但这个值是不确定的
- NSLog(@"[set anyObject]=%@",[set anyObject]);
- NSLog(@"[set anyObject]=%@",[set anyObject]);
- NSLog(@"[set anyObject]=%@",[set anyObject]);
-
- NSMutableSet *mset=[NSMutableSet set];
- [mset addObjectsFromArray:[NSArray arrayWithObjects:
- @"123",@"123",@"222",[[[NSObject alloc] init] autorelease],
- @"333",@"444",@"222",nil]];
- [mset removeObject:@"222"];
- NSLog(@"msetCount=%d and mset=%@",[mset count],mset);
- }
NSSet：
特点：
无序，唯一，仅限存非空的OC对象，本身初始化后内容不可变,其子类NSMutableSet为可变；
常用方法：
+(id)setWithObjects:(id)obj,...,nil;
-(NSUInteger)count;
// 返回任意的一个对象
-(id)anyObject;
NSMutableSet:
常用方法：
-(void)addObjectsFromArray:(NSArray *)from;
-(void)removeObject:(id)obj;
NSDictionary:
特点：
类似java中Map，键值对形式保存数据，无序，key唯一，key值仅限非空OC对象，
value值仅限OC对象，本身初始化后内容不可变，子类NSMutableDictionary可变；
常用方法：
+(id)dictionaryWithObjects:(NSArray *)objs forKeys:(NSArray *)keys;
//动态参数顺序为 val,key,val,key,...,nil
+(id)dictionaryWithObjectsAndKeys:(id)obj,...,nil;
@快速创建方式： //返回不可变的字典
@{key1:value1,key2:value2,...};
// 根据key获取值，便捷形式为 dict[key]
-(id)objectForKey:(id<NSCopying>)key;
//获取保存的键值对个数
-(NSUInteger)count;
//返回所有key的集合
-(NSArray *)allKeys;
//利用block遍历
-(void)enumerateKeysAndObjectsUsingBlock:^(id key,id obj,BOOL *stop)block;
NSMutableDictionary:
-(void)setObject:(id)obj forKey:(id<NSCopying>)key;
-(void)removeObjectForKey:(id)key;
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