Objective-C utility classes used in various InSeven Limited libraries and projects:
- ISNotifier
- NSDictionary+JSON
- NSObject+Serialize
- UIAlertView+Block
- UIApplication+Activity
- UIView+Utilities
ISUtilities is available through CocoaPods:
platform: ios, '6.0'
pod "ISUtilities", "~> 1.0"
A lightweight notificaion mechanism for observers for situations where NSNotificationCenter requires too much boiler-plate code or isn't explicit enough:
#import <ISUtilities/ISUtilities.h>
// Construct the notifier.
ISNotifier *notifier = [ISNotifier new];
// Add an observer.
id anObserver = [YourCustomClass new];
[notifier addObserver:anObserver];
// Notifying all observers.
[notifier notify:@selector(didUpdate:)
withObject:self];
// Remove the observer (optional).
[notifier removeObserver:anObserver];Notes:
- Observers are added and removed with the
addObserver:andremoveObserver:methods. - Observers are weakly referenced so it is not necessary to remove them when observers are released.
- Notifications are dispatched to all observers which respond to a given selector using the
notify:withObject:withObject:...methods. - It is recommended that you wrap the calls to
addObserver:andremoveObserver:with ones which enforce a protocol to avoid adding the wrong type of class or simply failing to implement one of your observer selectors. - ISNotifier is not thread-safe.
JSON serialization and de-serialization category for NSDictionary:
#import <ISUtilities/ISUtilities.h>
// Serialization.
NSDictionary *outDict = @{@"title": @"cheese"};
NSString *json = [outDict JSON];
NSLog(@"%@", json); // {"title": "cheese"}
// De-serialization.
NSDictionary *inDict = [NSDictionary dictionaryWithJSON:json];
NSLog(@"Title: %@", outDict[@"title"]); // Title: cheeseCategory for checking whether an NSObject can be serialized using the writeToFile:atomically: and writeToURL:atomically: methods:
#import <ISUtilities/ISUtilities.h>
// Dictionary containing safe objects.
NSDictionary *valid =
@{@"items":
@[@"one",
@"two",
@"three"]};
BOOL checkValid = [valid canWriteToFile]; // YES
// Dictionary containing unsafe objects.
NSArry *invalid =
@[[YourCustomClass new],
[YourCustomClass new]];
BOOL checkInvalid = [invalid canWriteToFile]; // NOThis can prove userful if it is necessary to ensure that an NSDictionary or NSArray and its contents can be safely stored to file. It works by validating that every object is an instance of NSData, NSDate, NSNumber, NSString, NSArray, or NSDictionary (as described in the documentation for NSArray and NSDictionary).
Initialize a UIAlertView with a completion block to avoid the need to conform to the UIAlertViewDelegate protocol and implementing alertView:clickedButtonAtIndex::
#import <ISUtilities/ISUtilities.h>
// Create the UIAlertView.
UIAlertView *alertView =
[[UIAlertView alloc] initWithTitle:@"Alert"
message:@"Click a button..."
completionBlock:^(NSUInteger buttonIndex) {
if (buttonIndex == 0) {
// Cancel...
} else if (buttonIndex == 1) {
// One...
} else if (buttonIndex == 2) {
// Two...
}
}
cancelButtonTitle:@"Cancel"
otherButtonTitles:@"One", @"Two", nil];
// Show the alert view.
[alertView show];Thread-safe category for managing the UIApplication network activity indicator by simply counting calls to beginNetworkActivity and endNetworkActivity:
#import <ISUtilities/ISUtilities.h>
// Long-running task.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) {
// Begin network activity.
[[UIApplication sharedApplication] beginNetworkActivity];
// Do some work...
// End network activity.
[[UIApplication sharedApplication] endNetworkActivity];
});
// Another long-running task.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) {
// Begin network activity.
[[UIApplication sharedApplication] beginNetworkActivity];
// Do other work...
// End network activity.
[[UIApplication sharedApplication] endNetworkActivity];
});Thread-safe category for managing the UIApplication idle timer by simply counting calls to disableIdleTimer and enableIdleTimer:
#import <ISUtilities/ISUtilities.h>
// Disable the idle timer.
[[UIApplication sharedApplication] disableIdleTimer];
// Play a video, etc...
// Re-enable the idle timer.
[[UIApplication sharedApplication] enableIdleTimer];A convenience category on UIView offering three bits of functionality:
- (BOOL)containsCurrentFirstResponderReturns YES if the UIView or any of its subviews is the current first responder, NO otherwise.
- (BOOL)resignCurrentFirstResponderResigns the first responder for the UIView and any of its subviews. Returns YES if a first responder was found and successfully resigned, NO otherwise.
- (BOOL)hasSuperviewOfKindOfClass:(Class)aClassWalks the UIView's superviews and returns YES if any are of kind of class aClass, NO otherwise.
Version 1.0.1
- FIX: Support for NULL blocks in UIAlertView+Block.
Version 1.0.0
- Initial release.
ISUtilities is available under the MIT license. See the LICENSE file for more info.