【深入浅出Objective-C】8.3字典(NSMutableDictionary)

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#import <Foundation/Foundation.h>int main(int argc, const char * argv[]){    @autoreleasepool {        NSDictionary *aDict = [NSDictionary dictionaryWithObject:@"value1" forKey:@"key1"];                NSDictionary *bDict = [[NSDictionary alloc]initWithObjects:[NSArray arrayWithObjects:@"coooliang",@"20",@"fz", nil] forKeys:[NSArray arrayWithObjects:@"name",@"age",@"city", nil]];        NSLog(@"aDict = %@",aDict);        NSLog(@"bDict = %@",bDict);                        //此处使用objectForKey和valueForKey结果相同        //键名不为NSString的时候，只能使用objectForKey,valueForKey键值只能是NSString        id name = [bDict objectForKey:@"name"];        if([name isKindOfClass:[NSString class]]){            NSLog(@"objectForKey name = %@",name);        }        id age = [bDict valueForKey:@"age"];        if([age isKindOfClass:[NSString class]]){            NSLog(@"valueForKey age = %@",age);        }                //遍历        NSEnumerator *aEnum = [bDict objectEnumerator];        id oneObj = nil;                while (oneObj = [aEnum nextObject]) {            if([oneObj isKindOfClass:[NSString class]]){                NSLog(@"%@",oneObj);            }        }                //访问所有键名和值以及配合NSDictionary        NSLog(@"allkey = %@",[bDict allKeys]);        NSLog(@"allValue = %@",[bDict allValues]);                //NSError *error = nil;        //NSDictionary *fileDict = [[NSFileManager alloc]attributesOfFileSystemForPath:@"path" error:&error];                //可变数组        NSMutableDictionary *maDict = [NSMutableDictionary dictionaryWithCapacity:0];        NSMutableDictionary *mbDict = [[NSMutableDictionary alloc]initWithObjects:[NSArray arrayWithObjects:@"a",@"b", nil] forKeys:[NSArray arrayWithObjects:@"va",@"vb", nil]];                [maDict addEntriesFromDictionary:mbDict];        [maDict setObject:@"c" forKey:@"vc"];        NSLog(@"maDict = %@",maDict);        [maDict removeAllObjects];        NSLog(@"remove a %@",maDict);        NSLog(@"remove after b %@",mbDict);    }    return 0;}
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