1 #import <Foundation/Foundation.h>
2 
3 @interface Demo01 : NSObject
4 
5 
6 -(void) run;
7 -(void) start;
8 
9 @end

 1 #import "Demo01.h"
 2 
 3 @implementation Demo01
 4 
 5 -(void) run
 6 {
 7     static int counter = 0;
 8     
 9     while(![[NSThread currentThread]isCancelled]){
10         [NSThread sleepForTimeInterval:1];
11         NSLog(@"当前数值：%i",counter++);
12     }
13     
14 }
15 
16 -(void) start
17 {
18     [NSThread detachNewThreadSelector:@selector(run) toTarget:self withObject:nil];
19 }
20 
21 @end

 1 #import <Foundation/Foundation.h>
 2 #import "Demo01.h"
 3 
 4 int main(int argc, const char * argv[])
 5 {
 6 
 7     @autoreleasepool {
 8         
 9         // insert code here...
10         NSLog(@"Hello, World!");
11         
12         [[[Demo01 alloc] init]start];
13         
14         while (YES) {
15             
16             [[NSRunLoop currentRunLoop]runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
17         }
18         
19     }
20     return 0;
21 }