大小写转换

//转换为大写

-(NSString *)changeupString:(NSString *)string{

return [string uppercaseString];//

}

//转换为开头大写,其余小写

-(NSString *)changeCapString:(NSString *)string{

return [string capitalizedString];//

}

//转换为小写

-(NSString *)changeLowerString:(NSString *)string{

return [string lowercaseString];//

}