Block修改变量容易被忽略的方法

C语言里面的

静态变量

静态全局变量

全局变量

其中静态变量和普通变量的截取模式是一样的，只是因为他赋值不被丢弃，所以能修改成功

code:

#import <Foundation/Foundation.h>

int global_val = 1;

static int static_global_val = 2;

int main(int argc, const char * argv[]) {

@autoreleasepool {

static int static_val = 3;

void (^blk)(void) = ^{

global_val = 5;

static_global_val = 10;

static_val = 20;

};

blk();

NSLog(@"global_val = %d", global_val);

NSLog(@"static_global_val = %d", static_global_val);

NSLog(@"static_val = %d", static_val);

}

return 0;

}