注册模块字符串判断

针对注册频繁判断字符串属性封装，日后完善自用

//1. 整形判断

+ (BOOL)isPureInt:(NSString *)string;

//2.浮点形判断：

+ (BOOL)isPureFloat:(NSString *)string;

//3.手机号码格式判断

+ (BOOL)valiMobile:(NSString *)mobile;

//4.判断字符串是否为空

+ (BOOL) isBlankString:(NSString *)string;

//5.判断字符串是否包含特殊字符

+(BOOL)isIncludeSpecialCharact: (NSString *)str;