OC学习:OC中的可变字典NSMutableDictionary和字典的遍历
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/*
不可变字典,在不可变字典中没有
*/
//可变字典继承了不可变字典的方法
NSMutableDictionary *mDictionary0 = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"value1",@"key1",@"value2",@"key2",@"value3",@"key3", nil];
NSArray *arrayKey = @[@"key1",@"key2",@"key3"];
NSArray *arrayValue = @[@"value1",@"value2",@"value3"];
NSMutableDictionary *mDictionary1 = [NSMutableDictionary dictionaryWithObjects:arrayValue forKeys:arrayKey];
//用新方法语句初始化可变字典是有警告的,如果对其进行增和删操作就会出错
// NSMutableDictionary *mDictionary2 = @{@"key1":@"value1",@"key2":@"value2"};
// [mDictionary2 setObject:@"value" forKey:@"key3"];
// NSLog(@"新语句%@",mDictionary2[@"key1"]); //此语句可以运行
//增和改 (改是在增加的基础上替换,这说明字典的key是不可以相同的)
[mDictionary1 setValue:@"value4" forKey:@"key4"];
NSLog(@"mDictionary1 %@",[mDictionary1 objectForKey:@"key4"]);
[mDictionary1 setValue:@"value4改" forKey:@"key4"];
mDictionary1[@"key1"] = @"value1改";
NSLog(@"mDictionary1 %@ , %@",mDictionary1[@"key1"],[mDictionary1 objectForKey:@"key4"]);
//遍历字典的两种方法
NSArray * allKey = [mDictionary1 allKeys];
for (id obj in allKey) {
NSLog(@"%@,%@",obj,[mDictionary1 objectForKey:obj]);
//在便利字典的时候可以删除字典元素,但是在数组中却不行
[mDictionary1 removeObjectForKey:obj];
[mDictionary1 removeAllObjects];
}
NSArray *keyMdictionary1 = [mDictionary1 allKeys];
NSEnumerator *enumer = [keyMdictionary1 objectEnumerator];
id obj;
while (obj = [enumer nextObject]) {
NSLog(@"%@,%@",obj,[mDictionary1 objectForKey:obj]);
//在便利字典的时候可以删除字典元素,但是在数组中却不行
[mDictionary1 removeObjectForKey:obj];
[mDictionary1 removeAllObjects];
}
//删
[mDictionary1 removeObjectsForKeys:arrayKey];
[mDictionary1 removeObjectForKey:@"key1"];
[mDictionary1 removeAllObjects];
不可变字典,在不可变字典中没有
*/
//可变字典继承了不可变字典的方法
NSMutableDictionary *mDictionary0 = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"value1",@"key1",@"value2",@"key2",@"value3",@"key3", nil];
NSArray *arrayKey = @[@"key1",@"key2",@"key3"];
NSArray *arrayValue = @[@"value1",@"value2",@"value3"];
NSMutableDictionary *mDictionary1 = [NSMutableDictionary dictionaryWithObjects:arrayValue forKeys:arrayKey];
//用新方法语句初始化可变字典是有警告的,如果对其进行增和删操作就会出错
// NSMutableDictionary *mDictionary2 = @{@"key1":@"value1",@"key2":@"value2"};
// [mDictionary2 setObject:@"value" forKey:@"key3"];
// NSLog(@"新语句%@",mDictionary2[@"key1"]); //此语句可以运行
//增和改 (改是在增加的基础上替换,这说明字典的key是不可以相同的)
[mDictionary1 setValue:@"value4" forKey:@"key4"];
NSLog(@"mDictionary1 %@",[mDictionary1 objectForKey:@"key4"]);
[mDictionary1 setValue:@"value4改" forKey:@"key4"];
mDictionary1[@"key1"] = @"value1改";
NSLog(@"mDictionary1 %@ , %@",mDictionary1[@"key1"],[mDictionary1 objectForKey:@"key4"]);
//遍历字典的两种方法
NSArray * allKey = [mDictionary1 allKeys];
for (id obj in allKey) {
NSLog(@"%@,%@",obj,[mDictionary1 objectForKey:obj]);
//在便利字典的时候可以删除字典元素,但是在数组中却不行
[mDictionary1 removeObjectForKey:obj];
[mDictionary1 removeAllObjects];
}
NSArray *keyMdictionary1 = [mDictionary1 allKeys];
NSEnumerator *enumer = [keyMdictionary1 objectEnumerator];
id obj;
while (obj = [enumer nextObject]) {
NSLog(@"%@,%@",obj,[mDictionary1 objectForKey:obj]);
//在便利字典的时候可以删除字典元素,但是在数组中却不行
[mDictionary1 removeObjectForKey:obj];
[mDictionary1 removeAllObjects];
}
//删
[mDictionary1 removeObjectsForKeys:arrayKey];
[mDictionary1 removeObjectForKey:@"key1"];
[mDictionary1 removeAllObjects];
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