GEEKING

iOS/RobloxUI/Source/Components/RBActivityIndicatorView.m

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+//
+//  RBActivityIndicatorView.m
+//  RobloxMobile
+//
+//  Created by Ariel Lichtin on 8/26/14.
+//  Copyright (c) 2014 ROBLOX. All rights reserved.
+//
+
+#import "RBActivityIndicatorView.h"
+#import <UIKit/UIKit.h>
+
+#define SPINNER_ICON_FRAME CGRectMake(0, 0, 32, 32)
+
+@implementation RBActivityIndicatorView
+{
+    UIImageView* _imageView;
+}
+
+- (id)initWithFrame:(CGRect)frame
+{
+    if (frame.size.width == 0 && frame.size.height == 0) {
+        frame = SPINNER_ICON_FRAME;
+    }
+    
+    self = [super initWithFrame:frame];
+    if (self)
+    {
+        [self initUI];
+    }
+    return self;
+}
+
+- (id)initWithCoder:(NSCoder *)aDecoder
+{
+    self = [super initWithCoder:aDecoder];
+    if (self)
+    {
+        [self initUI];
+    }
+    return self;
+}
+
+- (void) initUI
+{
+    self.backgroundColor = [UIColor clearColor];
+    
+    UIImage* loadingIcon = [UIImage imageNamed:@"Loading Icon"];
+    _imageView = [[UIImageView alloc] initWithImage:loadingIcon];
+    _imageView.frame = self.bounds;
+    _imageView.contentMode = UIViewContentModeCenter;
+    [self addSubview:_imageView];
+    
+    self.hidden = YES;
+}
+
+-(void) startAnimating
+{
+    self.hidden = NO;
+    
+    if(_imageView.layer.animationKeys.count == 0)
+    {
+        CABasicAnimation* rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
+        rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 /* full rotation*/];
+        rotationAnimation.duration = 1.0;
+        rotationAnimation.cumulative = YES;
+        rotationAnimation.repeatCount = HUGE_VALF;
+        rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
+        
+        [_imageView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
+    }
+}
+
+-(void) stopAnimating
+{
+    self.hidden = YES;
+    [_imageView.layer removeAllAnimations];
+}
+
+
+
+@end