1. Get the number of characters in a string
Create a string with initial value
var str = "Hello"
if str.count == 0 {
print("空值")
}
2. Traverse the string
for i in str {
print(i)
}
Create a string with initial value
var str = "Hello"
if str.count == 0 {
print("空值")
}
for i in str {
print(i)
}