1. - (IBAction)cancelImage:(id)sender {
2. _cancelButton.hidden = YES;
3. self.theImageView.image = [UIImage imageNamed:@"noImage50x118.png"];
4. }

1. - (IBAction)sendWeibo:(id)sender {
2. [self.theTextView resignFirstResponder];
3. NSString *content = [[NSString alloc] initWithString:_theTextView.text];
4. //计算发送微博的内容字数,并作相应的处理
5. NSInteger contentLength = content.length;
6. if (contentLength > 140) {
7. MBProgressHUD *overLengthHud = [[MBProgressHUD alloc] initWithView:self.view];
8. [self.view addSubview:overLengthHud];
9. overLengthHud.mode = MBProgressHUDModeText;
10. overLengthHud.labelText = @"提示信息";
11. overLengthHud.detailsLabelText = [NSString stringWithFormat:@"微博字数:%d 超过140上限！",contentLength];
12. [overLengthHud show:YES];
13. [overLengthHud hide:YES afterDelay:2];
14. }
15. else {
16. UIImage *image = _theImageView.image;
17. //没有图片
18. if (!hasPostImage) {
19. [self postWithText:content];
20. }
21. //有图片
22. else {
23. [self postWithText:content image:image];
24. }
25. hud = [[MBProgressHUD alloc] init];
26. hud.dimBackground = YES;
27. hud.labelText = @"正在发送...";
28. [hud show:YES];
29. [self.view addSubview:hud];
30. }
31. }

1. if (contentLength == 0) {
2. UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"请输入微博内容！" delegate:nil cancelButtonTitle:@"好" otherButtonTitles:nil, nil];
3. [alert show];
4. }
5. else if (contentLength > 140) {
6. }
7. else {
8. }

1. - (IBAction)addPhoto:(id)sender {
2. UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"插入图片" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"系统相册",@"拍摄", nil];
3. [alert show];
4. }
5. #pragma mark - UIAlertViewDelegate
6. - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
7. {
8. if (buttonIndex == 1)
9. {
10. [self addPhoto];
11. }
12. else if(buttonIndex == 2)
13. {
14. [self takePhoto];
15. }
16. }
17. - (void)addPhoto
18. {
19. UIImagePickerController * imagePickerController = [[UIImagePickerController alloc]init];
20. imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
21. imagePickerController.delegate = self;
22. imagePickerController.allowsEditing = NO;
23. [self presentModalViewController:imagePickerController animated:YES];
24. }
25. - (void)takePhoto
26. {
27. if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
28. {
29. UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
30. message:@"该设备不支持拍照功能"
31. delegate:nil
32. cancelButtonTitle:nil
33. otherButtonTitles:@"好", nil];
34. [alert show];
35. }
36. else
37. {
38. UIImagePickerController * imagePickerController = [[UIImagePickerController alloc]init];
39. imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
40. imagePickerController.delegate = self;
41. imagePickerController.allowsEditing = NO;
42. [self presentModalViewController:imagePickerController animated:YES];
43. }
44. }
45. #pragma mark - UIImagePickerControllerDelegate
46. - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
47. {
48. [picker dismissModalViewControllerAnimated:YES];
49. UIImage * image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
50. self.theImageView.image = image;
51. hasPostImage = YES;
52. _cancelButton.hidden = NO;
53. }

1. //发布文字微博
2. -(void) postWithText:(NSString*)text {
3. NSURL *url = [NSURL URLWithString:WEIBO_UPDATE];
4. ASIFormDataRequest *item = [[ASIFormDataRequest alloc] initWithURL:url];
5. [item setPostValue:[InfoForSina returnAccessTokenString]    forKey:@"access_token"];
6. [item setPostValue:text                                     forKey:@"status"];
7. [item setCompletionBlock:^{
8. self.theTextView.text = nil;
9. [hud removeFromSuperview];
10. MBProgressHUD *custuonHUD = [[MBProgressHUD alloc]initWithView:self.view];
11. custuonHUD.customView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"37x-Checkmark.png"]];
12. custuonHUD.labelText = @"发微博成功！";
13. custuonHUD.mode = MBProgressHUDModeCustomView;
14. [self.view addSubview:custuonHUD];
15. [custuonHUD show:YES];
16. [custuonHUD hide:YES afterDelay:1];
17. }];
18. [item startAsynchronous];
19. }
20. //发布文字图片微博
21. -(void)postWithText:(NSString *)text image:(UIImage*)image {
22. NSURL *url = [NSURL URLWithString:WEIBO_UPLOAD];
23. ASIFormDataRequest *item = [[ASIFormDataRequest alloc] initWithURL:url];
24. [item setPostValue:[InfoForSina returnAccessTokenString]    forKey:@"access_token"];
25. [item setPostValue:text                                     forKey:@"status"];
26. [item addData:UIImagePNGRepresentation(image)               forKey:@"pic"];
27. [item setCompletionBlock:^{
28. self.theImageView.image = [UIImage imageNamed:@"noImage50x118.png"];
29. self.theTextView.text = nil;
30. [hud removeFromSuperview];
31. _cancelButton.hidden = NO;
32. MBProgressHUD *custuonHUD = [[MBProgressHUD alloc]initWithView:self.view];
33. custuonHUD.customView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"37x-Checkmark.png"]];
34. custuonHUD.labelText = @"发微博成功！";
35. custuonHUD.mode = MBProgressHUDModeCustomView;
36. [self.view addSubview:custuonHUD];
37. [custuonHUD show:YES];
38. [custuonHUD hide:YES afterDelay:1];
39. }];
40. [item startAsynchronous];
41. }

使用时需要#import "ASIFormDataRequest.h"

有两点需要说明的是：

1、前面已经说到文字内容需要URLencode，在这里我么并没有做什么处理，因为我们使用的这个第三方类库已经帮我们实现了；对于微博图片内容，必须转换成binary现实，我们是这样处理的：UIImagePNGRepresentation(image)

NSData * UIImagePNGRepresentation (
   UIImage *image
);