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iOS Implementing Designs for iPhone Finishing the User Interface Adding a Pull-to-Refresh Control

Adding a pull-toRefresh 4 of 4

The task is: Finally, at the end of 'refreshBlogPosts', end the refresh control using the appropriate method. I write in the end of the function: if([self.refreshControl isRefreshing]){ [self.refreshControl endRefreshing]; } Error is: instance method '-isRefreshing' not found (return type defaults to 'id') if([self.refreshControl isRefreshing])

"isRefreshing is underlined.

What is wrong in the code, it seems to me that this task implies just copy-pasting from the video, no?

4 Answers

Your code should look like this:

  • (void)refreshBlogPosts { // ... retrieval code omitted for brevity ... [self.refreshControl endRefreshing] }

Following will do.

- (void)refreshBlogPosts {
    // ... retrieval code omitted for brevity ...
    [self.refreshControl endRefreshing];

I'd double check to make sure you have included all of the code in the video. Make sure you have the self.refreshControl = [[UIRefreshControl alloc] init]; in the viewDidLoad. I can't seem to recreate your error. Could maybe try what these guys suggest on stackoverflow. http://stackoverflow.com/questions/5293129/how-do-i-fix-this-warning-method-not-found-return-type-defaults-to-id

I'm having the same problem. I used the following code in the implementation file:

#import "MasterViewController.h"

@implementation MasterViewController

- (void)viewDidLoad {
    [super viewDidLoad];

self.refreshControl = [[UIRefreshControl alloc] init];
[self.refreshControl addTarget:self action:@selector(refreshBlogPosts) forControlEvents:UIControlEventValueChanged];

- (void)refreshBlogPosts {
    // ... retrieval code omitted for brevity ...
if ([self.refreshControl isRefreshing]) {
            [self.refreshControl endRefreshing];}


I'm getting the following error in the "preview":

instance method '-isRefreshing' not found (return type defaults to 'id')
if ([self.refreshControl isRefreshing]) {
note: receiver is instance of class declared here
@interface UIRefreshControl : NSObject
1 error generated.

Aside from sloppy indentation, can anyone clarify what I/we're doing wrong? If it's a matter of the return type not being a pointer or defining "isRefreshing" in the header (as suggested in stackoverflow reference) seems a bit off considering the error confirms that "UIRefreshControl.h" is being referenced? Then again, I barely know what I'm talking about. Any/all clarification is welcome.