Swift中for循环的递减操作实现

// 正常获取内容
for i in 0..<count {

print("\(i)")
}

var i = count;

while i >= 0 {

print(i);

i -= 1;
}

// 递减操作
for i in (0..<count).reverse() {

print("\(i)")
}

for i in NSArray.reverse() {

print("\(i)")
}