TLModalActivityIndicatorView.m

//
//  TLModalActivityIndicatorView.m
//  TLCommon
//
//  Created by Joshua Bleecher Snyder on 9/10/09.
//

#import "TLModalActivityIndicatorView.h"
#import "CGGeometry_TLCommon.h"

#define kModalSize 160.0f
#define kCornerRadius 20.0f
#define kLabelHeight 30.0f
#define kLabelFont [UIFont fontWithName:@"Helvetica" size:18.0f]
#define kModalColor [UIColor colorWithWhite:0.3 alpha:0.8]
#define kStartingScale 1.8f
#define kAnimationDuration 0.25f

#pragma mark -

@interface TLModalActivityIndicatorView ()

@property(nonatomic, retain, readwrite) UIActivityIndicatorView *spinner;

@end


#pragma mark -

@implementation TLModalActivityIndicatorView

@synthesize spinner;

- (id)initWithText:(NSString *)text {
  if(self = [super initWithFrame:CGRectZero]) {
    UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;
    CGSize keyWindowSize = keyWindow.bounds.size;
    CGPoint keyWindowCenter = CGPointMake(keyWindowSize.width / 2.0f, keyWindowSize.height / 2.0f);

    self.frame = CGRectZeroWithSize(keyWindowSize);
    self.backgroundColor = [UIColor clearColor];
    
    CALayer *backgroundLayer = [CALayer layer];
    backgroundLayer.cornerRadius = kCornerRadius;
    backgroundLayer.masksToBounds = YES;
    backgroundLayer.bounds = CGRectMake(0.0f, 0.0f, kModalSize, kModalSize);
    backgroundLayer.position = keyWindowCenter;
    backgroundLayer.backgroundColor = kModalColor.CGColor;
    
    UILabel *label = [[[UILabel alloc] initWithFrame:CGRectMake(keyWindowCenter.x - kModalSize / 2.0f,
                                                                keyWindowCenter.y + kModalSize / 2.0f - kLabelHeight,
                                                                kModalSize,
                                                                kLabelHeight)]
                      autorelease];
    label.text = text;
    label.textColor = [UIColor whiteColor];
    label.backgroundColor = [UIColor clearColor];
    label.font = kLabelFont;
    label.textAlignment = UITextAlignmentCenter;
    self.spinner = [[[UIActivityIndicatorView alloc] initWithFrame:CGRectZero] autorelease];
    self.spinner.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
    [self.spinner sizeToFit];
    [self.spinner startAnimating];
    
    self.spinner.center = keyWindowCenter;
    
    [self.layer addSublayer:backgroundLayer];
    [self addSubview:label];
    [self addSubview:self.spinner];    

    self.transform = CGAffineTransformMakeScale(kStartingScale, kStartingScale);
  }
  return self;
}

- (void)show {
  [[UIApplication sharedApplication].keyWindow addSubview:self];
  [UIView beginAnimations:@"modalSpinner" context:NULL];
  self.transform = CGAffineTransformIdentity;
  [UIView setAnimationDuration:kAnimationDuration];
  [UIView commitAnimations];
}

- (void)dismiss {
  [self removeFromSuperview];
}

- (void)dealloc {
  [spinner release];
  spinner = nil;
  
  [super dealloc];
}

@end