Simple KVO data binding category for NSObject
UIView *userProfileView = [[UIView alloc] init];
UILabel *displayNameLabel = [[UILabel alloc] init];
UILabel *usernameLabel = [[UILabel alloc] init];
UIImageView *profilePic = [[UIImageView alloc] init];
[userProfileView addSubview:profilePic];
[userProfileView addSubview:displayNameLabel];
[userProfileView addSubview:usernameLabel];
// Setup layout
// ...
displayNameLabel.textKeyPath = @"fullName";
usernameLabel.textKeyPath = @"username";
// bindings can be applied even when the data types don't necessarily match
profilePic.imageKeyPath = @"profilePicUrl";
// just apply a binding transform and callback with the converted data
// you can even do this asynchronously, or multiple times per change
profilePic.imageTransform = ^(NSURL *url, transform_completed_t callback) {
UIImage *profilePic = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];
// don't worry about being on the UI thread when you callback
// you'll be put there automatically
callback(profilePic);
};
// default values can be supplied for any binding
displayNameLabel.textDefault = @"John Doe";
usernameLabel.textDefault = @"unknown";
profilePic.imageDefault = [UIImage imageNamed:@"default-profilepic.png"];
// Just bind the data to any superview of the bound views and you're all set!
// -------
userProfileView.dataSource = superAwesomeUser;
[cell.textLabel bindKeyPath:@"text"
toKeyPath:@"title"
onObject:item
defaultValue:@"Default Title"];[cell.imageView bindKeyPath:@"image"
toKeyPath:@"color"
onObject:item
transformedBy:^(NSString *color) {
UIImage *loadedImage = nil;
if (color) {
loadedImage = [UIImage imageNamed:[NSString stringWithFormat:@"img-%@.png", color]];
}
return loadedImage;
}];