iOS OpenGL shader 语句字符串化

//
// ViewController.m
// test_NSString_define_01
//
// Created by jeffasd on 16/8/8.
// Copyright © 2016年 jeffasd. All rights reserved.
//

#import "ViewController.h"

//#x 将参数x字符串化
#define STRINGIZE(x) #x
#define STRINGIZE2(x) STRINGIZE(x)
#define SHADER_STRING(text) @ STRINGIZE2(text)

NSString *const KShaderString = SHADER_STRING
(
float textWIdth;
);

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

NSLog(@"the kShaderString is %@", KShaderString);

}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end