获取验证码按钮

Question

一个获取验证码，实现倒计时的封装类。
有OC版本和Swift版本,git地址:
https://github.com/ZHShare/XFetchCodeButton.git

// 部分代码
Swift:
let codeButton = XFetchCodeButton(frame: CGRect(x: 20, y: 100, width: 100, height: 50))
codeButton.backgroundColor = .black
codeButton.normalTitle = "Fetch Code"
codeButton.normalTintColor = UIColor.white
self.view.addSubview(codeButton)

codeButton.doneSend {
print("codeButton 已发送")
}
OC:
XFetchCodeButton * button = [[XFetchCodeButton alloc] initWithFrame:CGRectMake(20, 100, 100, 50)];
button.backgroundColor = [UIColor blackColor];
[self.view addSubview:button];

[button doneSend:^{
NSLog(@"button click");
}];

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