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BDViewController+Private.m
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BDViewController+Private.m
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//
// BDViewController+Private.m
// BDDynamicGridViewDemo
//
// Created by Nor Oh on 6/21/12.
// Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//
#import "BDViewController+Private.h"
#define kNumberOfPhotos 25
@implementation BDViewController (Private)
-(void)buildBarButtons
{
UIBarButtonItem * reloadButton = [[UIBarButtonItem alloc] initWithTitle:@"Lay it!"
style:UIBarButtonItemStylePlain
target:self
action:@selector(animateReload)];
self.navigationItem.rightBarButtonItems = [NSArray arrayWithObjects: reloadButton, nil];
}
-(NSArray*)_imagesFromBundle
{
NSArray *images = [NSArray array];
NSBundle *bundle = [NSBundle mainBundle];
for (int i=0; i< kNumberOfPhotos; i++) {
NSString *path = [bundle pathForResource:[NSString stringWithFormat:@"%d", i + 1] ofType:@"jpg"];
UIImage *image = [UIImage imageWithContentsOfFile:path];
if (image) {
images = [images arrayByAddingObject:image];
}
}
return images;
}
- (void)_demoAsyncDataLoading
{
_items = [NSArray array];
//load the placeholder image
for (int i=0; i < kNumberOfPhotos; i++) {
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"placeholder.png"]];
imageView.frame = CGRectMake(0, 0, 44, 44);
imageView.clipsToBounds = YES;
_items = [_items arrayByAddingObject:imageView];
}
[self reloadData];
NSArray *images = [self _imagesFromBundle];
for (int i = 0; i < images.count; i++) {
UIImageView *imageView = [_items objectAtIndex:i];
UIImage *image = [images objectAtIndex:i];
imageView.frame = CGRectMake(0, 0, image.size.width, image.size.height);
[self performSelector:@selector(animateUpdate:)
withObject:[NSArray arrayWithObjects:imageView, image, nil]
afterDelay:0.2 + (arc4random()%3) + (arc4random() %10 * 0.1)];
}
}
- (void) animateUpdate:(NSArray*)objects
{
UIImageView *imageView = [objects objectAtIndex:0];
UIImage* image = [objects objectAtIndex:1];
[UIView animateWithDuration:0.5
animations:^{
imageView.alpha = 0.f;
} completion:^(BOOL finished) {
imageView.image = image;
[UIView animateWithDuration:0.5
animations:^{
imageView.alpha = 1;
} completion:^(BOOL finished) {
NSArray *visibleRowInfos = [self visibleRowInfos];
for (BDRowInfo *rowInfo in visibleRowInfos) {
[self updateLayoutWithRow:rowInfo animiated:YES];
}
}];
}];
}
@end