IOS开发指南之Swift字典遍历

1.创建与初始化字典 

var student:Dictionary<String,Int> = ["C":10001,"C++":10002,"C#":10003]

2.向字典添加键值对: KEY->LUA,VALUE->10004

student["LUA"]=10004

3.普通遍历k为键,v为值

for (k,v) in student  //无序
{
    print("key:\(k) value:\(v)")
}

4.元组方式遍历

//遍历字典(元组模式)
for tuples in student  //无序
{
    print("key0 of tuples :\(tuples.0) key1 of tuples:\(tuples.1)")
}

5.只遍历键

//通过键遍历
for k in student.keys
{
    print("key=:\(k)")
    
}

6.只遍历值

//通过值遍历
for v in student.values
{
    print("v