相关疑难解决方法(0)

如何获取字符串的第n个字符？我尝试了托架([])访问器没有运气.

var string = "Hello, world!"

var firstChar = string[0] // Throws error

错误:'subscript'不可用:不能使用Int下标String,请参阅文档注释以供讨论

我有一个UILabel名为titleLabel我的故事板的笔尖被设置为默认的高度.我希望它以编程方式扩展以适应它的内容.这是我到目前为止所尝试的:

// just setting content
titleLabel.text = "You don't always know what you are getting with mass-market cloud computing services. But with SimpliCompute, the picture is clear. SimpliCompute gives you powerful virtual servers you can deploy using just your web browser. That’s enterprise grade technology you can deploy and control on-the-fly."

titleLabel.numberOfLines = 0

titleLabel.preferredMaxLayoutWidth = 700

titleLabel.lineBreakMode = NSLineBreakMode.ByWordWrapping

titleLabel.sizeToFit()

这对我来说无论如何都不适合!我总是只看到一行文字UILabel.我究竟做错了什么？

我绝对需要文本内容可变.