验证数字：^[0-9]$验证n位的数字：^\d{n}$验证至少n位数字：^\d{n,}$验证m-n位的数字：^\d{m,n}$验证数字和小数点:...

#!/usr/bin/python # -*- coding: UTF-8 -*- import os import copy import t...

设置UITextField的placeholder的颜色代码片段：textField.placeholder = @"请输入用户名!";[tex...

WKWebView API介绍 WKWebView的头文件声明 WKWebViewConfiguration配置 WKPreferences偏好...

///不需要带参数情况if ([self.view respondsToSelector:NSSelectorFromString(@"setS...

#!/usr/bin/python # -*- coding: UTF-8 -*- import os import copy import t...

#!/usr/bin/python # -*- coding: UTF-8 -*- import os import copy import s...

#!/usr/bin/python # -*- coding: UTF-8 -*- import os import time import s...

#!/usr/bin/python # -*- coding: UTF-8 -*- import os import copy import s...