让我们来看看是如何实现的吧，首先要知道打印机的ip地址，然后用socket通过打印机的ip地址进行传送要打印的内容，并传送让打印机打印的指令即可。

代码如下：

.h 里面

1. #import
2. #import "AsyncSocket.h"
3. @interface ViewController : UIViewController
4. {
5. AsyncSocket *asyncSocket;
6. }
7. @end

.m里面

1. #import "ViewController.h"
2. @interface ViewController ()
3. @end
4. @implementation ViewController
5. - (void)viewDidLoad {
6. [super viewDidLoad];
7. // NSError *err = nil;
8. // if(![asyncSocket connectToHost:@"192.168.1.105" onPort:18011 error:&err])
9. // {
10. // asyncSocket = [[AsyncSocket alloc] initWithDelegate:self];
11. //
12. // [asyncSocket setRunLoopModes:[NSArray arrayWithObject:NSRunLoopCommonModes]];
13. //
14. // if (![self SocketOpen:@"192.168.1.105" port:18011])
15. // {
16. // NSMutableString *sendString=[NSMutableString stringWithCapacity:1000];
17. // [sendString appendString:@"非警务健身房"];
18. // NSData *cmdData = [sendString dataUsingEncoding:NSUTF8StringEncoding];
19. //
20. // [asyncSocket writeData:cmdData withTimeout:-1 tag:0];
21. // }
22. // NSLog(@"Error: %@", err);
23. // }
24. }
25. -(IBAction)haha:(id)sender{
26. asyncSocket=nil;
27. NSError *err = nil;
28. if(![asyncSocket connectToHost:@"192.168.1.105" onPort:18011 error:&err])
29. {
30. asyncSocket = [[AsyncSocket alloc] initWithDelegate:self];
31. [asyncSocket setRunLoopModes:[NSArray arrayWithObject:NSRunLoopCommonModes]];
32. if (![self SocketOpen:@"192.168.1.105" port:18011])
33. {
34. NSMutableString *sendString=[NSMutableString stringWithCapacity:100000];
35. [sendString appendString:@"Socket测试成功！！！！"];
36. NSData *cmdData = [sendString dataUsingEncoding:NSUTF8StringEncoding];
37. [asyncSocket writeData:cmdData withTimeout:-1 tag:0];
38. }
39. NSLog(@"Error: %@", err);
40. }
41. }
42. - (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port
43. {
44. NSLog(@"onSocket:%p didConnectToHost:%@ port:%hu", sock, host, port);
45. [sock readDataWithTimeout:1 tag:0];
46. }
47. -(void) onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag
48. {
49. }
50. - (void)onSocket:(AsyncSocket *)sock didSecure:(BOOL)flag
51. {
52. NSLog(@"onSocket:%p didSecure:YES", sock);
53. }
54. - (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err
55. {
56. NSLog(@"onSocket:%p willDisconnectWithError:%@", sock, err);
57. }
58. - (void)onSocketDidDisconnect:(AsyncSocket *)sock
59. {
60. //断开连接了
61. NSLog(@"onSocketDidDisconnect:%p", sock);
62. }
63. - (void)didReceiveMemoryWarning {
64. [super didReceiveMemoryWarning];
65. }
66. - (void)viewDidUnload {
67. asyncSocket=nil;
68. }
69. //打开
70. - (NSInteger)SocketOpen:(NSString*)addr port:(NSInteger)port
71. {
72. if (![asyncSocket isConnected])
73. {
74. [asyncSocket connectToHost:addr onPort:port withTimeout:-1 error:nil];
75. NSLog(@"connect to Host:%@ Port:%d",addr,port);
76. }
77. return 0;
78. }

其他的方法，还有利用UIPrintInteractionController，不过这需要打印机设置中有AirPrinter。