定义字典
OC:
NSDictionary *dict =[NSDictionary dictionaryWithObject:
@“qbs" forKey:@"name"];
NSLog(@"%@", dict);
输出结果:
2016-01-06 15:09:11.214 OCTest[3773:761032] {
name = gxq;
name = gxq;
}
NSDictionary *dict =[NSDictionary dictionaryWithObjectsAndKeys:
@"name", @"qbs",
@"age", @20, nil];
NSLog(@"%@", dict);
输出结果:
2016-01-06 15:13:39.853 OCTest[3831:792730] {
gxq = name;
20 = age;
gxq = name;
20 = age;
}
NSDictionary *dict = @{@"name":@"qbs", @"age":@20};
NSLog(@"%@", dict);
输出结果:
2016-01-06 15:14:57.616 OCTest[3841:801710] {
age = 20;
name = gxq;
age = 20;
name = gxq;
}
swift:
key一定要是可以hash的(String, Int, Float, Double, Bool)
value没有要求
var dict = ["name":"qbs", "age":20]
print(dict)
var dict1:Dictionary = ["name":"qbs", "age":20]
print(dict1)
var dict2:Dictionary<String,AnyObject> = ["name":"qbs", "age":20]
print(dict2)
var dict3:[String:AnyObject] = ["name":"qbs", "age":20]
print(dict3)
var dict4:[String:AnyObject] =
Dictionary(dictionaryLiteral: ("name", "qbs"), ("age", 20))
print(dict4)
输出结果:
["age": 20, "name": qbs]
["age": 20, "name": qbs]
["age": 20, "name": qbs]
["age": 20, "name": qbs]
["age": 20, "name": qbs]
可变字典:
var dict5 = [:]
不可变字典:
let dict6 = [:]
字典操作
OC:
获取
NSDictionary *dict = @{@"name":@"qbs", @"age":@20};
NSLog(@"%@", dict[@"name"]);
输出结果:
2016-01-06 15:26:00.351 OCTest[3923:881138] gxq
修改
NSMutableDictionary *dict =
[NSMutableDictionary dictionaryWithObjectsAndKeys:
@"name", @"qbs",
@"age", @20, nil];
dict[@"name"] = @"iversion";
NSLog(@"%@", dict[@"name"]);
NSMutableDictionary *dict =
[NSMutableDictionary dictionaryWithObjectsAndKeys:
@"name", @"qbs",
@"age", @20, nil];
[dict setObject:@"iversion" forKey:@"name"];
NSLog(@"%@", dict[@"name"]);
输出结果:
2016-04-01 15:27:01.704 OCTest[3933:890317] iversion
2016-04-01 15:28:21.398 OCTest[3943:899613] iversion
swift:
获取
var dict = ["name":"qbs", "age":20]
print(dict["name"]!)
输出结果: gxq
修改
var dict = ["name":"qbs", "age":20]
dict["name"] = "iverson"
print(dict["name"]!)
print(dict["name"]!)
var dict1 = ["name":"qbs", "age":20]
dict1.updateValue("iverson", forKey: "name")
print(dict["name"]!)
输出结果:
iverson
iverson
更新
updateValue返回一个可选类型
如果字典中不存在需要更新的key, 那么返回nil, 如果存在返回原始值
var dict = ["name":"qbs", "age":25]
if let orignal = dict.updateValue("iverson", forKey: "name")
{
print(dict["name"]!)
print(orignal)
{
print(dict["name"]!)
print(orignal)
}
输出结果:
iverson
qbs
updateValue返回一个可选类型
如果字典中不存在需要更新的key, 那么返回nil并且会将新的键值对添加到字典中
var dict = ["name":"qbs", "age":25]
if let orignal = dict.updateValue("iverson", forKey: "abc")
{
print(dict["abc"]!)
print(orignal)
}
{
print(dict["abc"]!)
print(orignal)
}
print(dict)
输出结果: ["abc": iverson, "age": 25, "name": qbs]
添加
OC:
NSMutableDictionary *dict =
[NSMutableDictionary dictionaryWithObjectsAndKeys:
@"name", @"qbs",
@"age", @25, nil];
dict[@"height"] = @100;
NSLog(@"%@", dict);
输出结果:
2016-04-01 15:35:11.734 OCTest[4025:946250] {
qbs = name;
25 = age;
height = 100;
height = 100;
}
NSMutableDictionary *dict =
[NSMutableDictionary dictionaryWithObjectsAndKeys:
@"name", @“QBS",
@"age", @30, nil];
[dict setObject:@200 forKey:@"height"];
NSLog(@"%@", dict);
输出结果:
2016-04-01 15:36:15.768 OCTest[4035:953931] {
QBS = name;
30 = age;
height = 200;
height = 200;
}
swift:
var dict = ["name”:"Qbs", "age":50]
dict["height"] = 160;
print(dict)
输出结果: ["height": 160, "age": 50, "name": Qbs]
删除
OC:
NSMutableDictionary *dict =
[NSMutableDictionary dictionaryWithObjectsAndKeys:
@"qbs",@"name",
@30,@"age",nil];
[dict removeObjectForKey:@"name"];
NSLog(@"%@", dict);
输出结果:
2016-04-01 15:40:37.801 OCTest[4058:981747] {
age = 30;
}
NSMutableDictionary *dict =
[NSMutableDictionary dictionaryWithObjectsAndKeys:
@“qbs",@"name",
@30,@"age",nil];
[dict removeAllObjects];
NSLog(@"%@", dict);
输出结果:
2016-04-01 15:41:20.705 OCTest[4068:989096] {
}
swift:
var dict = ["name":"qbs", "age":10]
dict.removeValueForKey("name")
print(dict)
输出结果: ["age": 10]
removeValueForKey返回一个可选类型
如果字典中不存在需要删除的key, 那么返回nil并且不会执行任何操作
如果存在则删除key对应的值, 并且返回被删除的值
var dict = ["name”:"abs", "age”:20]
if let orignal = dict.removeValueForKey("names")
{
print(dict)
print(orignal)
}
{
print(dict)
print(orignal)
}
print(dict)
输出结果:["age": 30, "name": qbs]
var dict = ["name”:”qbs", "age":30]
dict.removeAll(keepCapacity: true)
遍历字典
OC:
NSMutableDictionary *dict =
[NSMutableDictionary dictionaryWithObjectsAndKeys:
@"qbs",@"name",
@40,@"age",nil];[dictenumerateKeysAndObjectsUsingBlock:^(idkey,idobj,BOOL*stop) {
NSLog(@"key = %@ value = %@", key, obj);
}];
输出结果:
2016-04-01 15:45:59.810 OCTest[4117:1022823] key = name value = qbs
2016-04-01 15:45:59.811 OCTest[4117:1022823] key = age value = 40
NSMutableDictionary *dict =
[NSMutableDictionary dictionaryWithObjectsAndKeys:
@“qbs", @"name",
@40, @"age", nil];
NSArray *keys = [dict allKeys];
for (NSString *key in keys) {
NSLog(@"%@", key);
}
输出结果:
2016-04-01 15:48:07.861 OCTest[4137:1039198] name
2016-04-01 15:48:07.862 OCTest[4137:1039198] age
NSMutableDictionary *dict =
[NSMutableDictionary dictionaryWithObjectsAndKeys:
@"qbs", @"name",
@40, @"age", nil];
NSArray *keys = [dict allValues];
for (NSString *key in keys) {
NSLog(@"%@", key);
}
输出结果:
2016-04-01 15:49:20.375 OCTest[4148:1049548] gxq
2016-04-01 15:49:20.376 OCTest[4148:1049548] 40
var dict1 = ["name”:"Qbs", "age":30]
for (key , value) in dict1
{
print("key = (key) value = (value)")
{
print("key = (key) value = (value)")
}
输出结果:
key = age value = 30
key = name value = Qbs
var dict2 = ["name”:"Qbs", "age":40]
for key in dict2.keys
{
print("key = (key)")
{
print("key = (key)")
}
输出结果:
key = age
key = name
var dict3 = ["name”:"Qbs", "age":50]
for value in dict3.values
{
print("value = (value)")
{
print("value = (value)")
}
输出结果:
value = 50
value = Qbs