custom UIProgressView class works on 64 bit device but not others - ios

Question

I have a custom UIProgressView class (from John Rommel Estropia) which works perfect on 64 bit iPhone simulator and device. But when I run it on 32bit simulators/devices it did not show on the screen? Any idea?
This problem also valid for another class for drawing circular progress.
Here is .m file:
#import "SPKProgress.h"
#interface SPKProgress()
#property (nonatomic, weak) UIImageView *trackImageView;
#property (nonatomic, weak) UIImageView *progressImageView;
#end
#implementation SPKProgress
#pragma mark - NSObject
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
[self setupProgressView];
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self)
{
[self setupProgressView];
}
return self;
}
#pragma mark - UIView
- (void)layoutSubviews
{
[super layoutSubviews];
UIImageView *trackImageView = self.trackImageView;
UIImageView *progressImageView = self.progressImageView;
if (!trackImageView || !progressImageView)
{
return;
}
CGRect bounds = self.bounds;
CGFloat boundsTop = CGRectGetMinY(bounds);
UIImage *trackImage = self.trackImage;
if (trackImage)
{
CGRect trackFrame = trackImageView.frame;
CGFloat trackHeight = trackImage.size.height;
trackImageView.frame = (CGRect){
.origin.x = CGRectGetMinX(trackFrame),
.origin.y = (boundsTop
+ ((CGRectGetHeight(bounds) - trackHeight) * 0.5f)),
.size.width = CGRectGetWidth(trackFrame),
.size.height = trackHeight
};
}
UIImage *progressImage = self.progressImage;
if (progressImage)
{
CGRect progressFrame = progressImageView.frame;
CGFloat progressHeight = progressImage.size.height;
progressImageView.frame = (CGRect){
.origin.x = CGRectGetMinX(progressFrame),
.origin.y = (boundsTop
+ ((CGRectGetHeight(bounds) - progressHeight) * 0.5f)),
.size.width = CGRectGetWidth(progressFrame),
.size.height = progressHeight
};
}
}
#pragma mark - UIProgressView
- (void)setProgressImage:(UIImage *)progressImage
{
[super setProgressImage:progressImage];
self.progressImageView.image = progressImage;
}
- (void)setTrackImage:(UIImage *)trackImage
{
[super setTrackImage:trackImage];
self.trackImageView.image = trackImage;
}
#pragma mark - private
- (void)setupProgressView
{
if ([self compareVersionString:[UIDevice currentDevice].systemVersion
withVersionString:#"7.1"] == NSOrderedAscending)
{
return;
}
NSArray *subviews = self.subviews;
if ([subviews count] != 2)
{
return;
}
for (UIView *subview in subviews)
{
if (![subview isKindOfClass:[UIImageView class]])
{
return;
}
}
self.trackImageView = subviews[0];
self.progressImageView = subviews[1];
self.trackImageView.image = self.trackImage;
self.progressImageView.image = self.progressImage;
}
- (NSComparisonResult)compareVersionString:(NSString *)versionString1
withVersionString:(NSString *)versionString2
{
NSArray *components1 = [versionString1 componentsSeparatedByString:#"."];
NSArray *components2 = [versionString2 componentsSeparatedByString:#"."];
NSUInteger components1Count = [components1 count];
NSUInteger components2Count = [components2 count];
NSUInteger partCount = MAX(components1Count, components2Count);
for (NSInteger part = 0; part < partCount; ++part)
{
if (part >= components1Count)
{
return NSOrderedAscending;
}
if (part >= components2Count)
{
return NSOrderedDescending;
}
NSString *part1String = components1[part];
NSString *part2String = components2[part];
NSInteger part1 = [part1String integerValue];
NSInteger part2 = [part2String integerValue];
if (part1 > part2)
{
return NSOrderedDescending;
}
if (part1 < part2)
{
return NSOrderedAscending;
}
}
return NSOrderedSame;
}
#end
And the header file:
#import <UIKit/UIKit.h>
#interface SPKProgress : UIProgressView
#end