pod ‘EGSpinner’

- (void) viewDidLoad
{
[super viewDidLoad];

// example

// initialization
EGCleverProgress* clever = [[EGCleverProgress alloc] init];
clever.cleverBackgroundColor = [UIColor greenColor];

// custom delegate
clever.delegate = self;

// customization of button on clever progress
clever.closeButton.hidden = NO;
[clever.closeButton setImage:[UIImage imageNamed:@"[email protected]"] forState:UIControlStateNormal];

// alertLabel & cleverView customization
clever.cleverView.backgroundColor = UIColor.redColor;
clever.alertLabel.textColor = UIColor.magentaColor;

[self.view addSubview:clever];

}

@class EGCleverProgress;

static NSString* loadingNotification = @"EGCleverProgressLoadingNotification";
static NSString* hasBeenDownloadedNotification = @"EGCleverProgressHasBeenDownloadedNotification";

@protocol EGCleverProgressDelegate <NSObject>

@optional

- (void) didSelectCleverButton:(EGCleverProgress*) clever;
- (void) cleverProgress:(EGCleverProgress*) clever didSelectCloseButton:(UIButton*) closeButton;

@end

@interface EGCleverProgress : UIView

// initialization
- (instancetype)init;

// system
@property (strong, nonatomic) UIView* cleverView;
@property (strong, nonatomic) UILabel* alertLabel;
@property (strong, nonatomic) UIButton* closeButton;
@property (strong, nonatomic) EGSpinnerLayer* spinner;

// for user
@property (strong, nonatomic) UIColor* cleverBackgroundColor;
@property (weak, nonatomic) id <EGCleverProgressDelegate> delegate;

@end

@interface EGSpinnerLayer : CAShapeLayer

- (instancetype) initWithFrame:(CGRect)frame;
- (void) startSpin;
- (void) stopSpin;

@end

// notify Clever Progress to start the spinner at the beginning of loading process.
[[NSNotificationCenter defaultCenter] postNotificationName:loadingNotification object:nil];

// Here after 3 seconds spinner will stop and alertLabel will update its status to "Data has been downloaded"
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[[NSNotificationCenter defaultCenter] postNotificationName:hasBeenDownloadedNotification object:@{@"status":@"Data has been downloaded"}];
clever.closeButton.hidden = YES;
});