Swift中字符串,字典,数组,集合的遍历

//字符串的遍历(3中写法)
(1)
var
str = "China"
for item in str.characters {
print(item)
(2)
for item in str.characters.indices {
print(str[item])
}
(3)
var i = 0
while i < str.characters.count {
let index = str.index(str.startIndex, offsetBy: i)
print(str[index])
i += 1
}
//数组的遍历
var arr = [23,1,23,43,34,5]
for item in arr {
print(item)
}
for(index,value)in arr.enumerated() {
print(index,value)
}
print("数组遍历下标的方法")
var j = 0
while j < arr.count {
print(arr[j])
j += 1
}

//集合遍历
var set:Set = ["china","beijing","shanghai","china"]
print(set)
for item in set {
print(item)
}
for (i,item) in set.sorted().enumerated() {
print(i,item)
}

//字典遍历
var dic = [1001:"C",1002:"OC",1003:"iOS",1004:"Jave"]
dic[1005] = "C++"
dic[1001] = "C#"
(1)
for item in dic {
print(item)
}
(2)
for item in dic.keys {
print(item,dic[item]!)
}
(3)
for item in dic.values {
print(item)
}

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