Workaround an annoying bug with iOS 7.1 where custom track and progress images for UIProgressView gets ignored

JEProgressView.h

//
//  JEProgressView.h
//  
//
//  Created by John Rommel Estropia on 2014/03/11.
//  Copyright (c) 2014 John Rommel Estropia.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

#import <UIKit/UIKit.h>

// iOS 7.1 bugfix
// http://stackoverflow.com/questions/22311516/uiprogressview-custom-track-and-progress-images-in-ios-7-1
@interface JEProgressView : UIProgressView

@end

JEProgressView.m

//
//  JEProgressView.m
//  
//
//  Created by John Rommel Estropia on 2014/03/11.
//  Copyright (c) 2014 John Rommel Estropia.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

#import "JEProgressView.h"


@interface JEProgressView ()

@property (nonatomic, weak) UIImageView *trackImageView;
@property (nonatomic, weak) UIImageView *progressImageView;

@end


@implementation JEProgressView

#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

Problem: AlertView drops custom image from JEProgressView's ProgressImage and change it on default values (plane color). By the way TrackImage is ok.

Hi,

thanks for this fix. It totally fits my needs in a project.
Could you explain, why you calculate the origin on the y-axis of the image views the way you are doing it? With your original Code, the two imageViews will have an origin of -7.25 using images with a height of 17px, cause the heigth of the UIProgressView itself is 2,5px, even though I set a frame with a height of 17px.

When I change the line

.origin.y = (boundsTop + ((CGRectGetHeight(bounds) - trackHeight) * 0.5f)),

to

.origin.y = CGRectGetMinY(trackFrame),

the progress image view is positioned as expected. (I do not use an image for the track)

Regards
Oliver

@oklimberg: My computation makes it so that the imageViews are vertically centered within the parent UIProgressView.

works great.

Note: height of progressView is still set to 2., so remember to set progressBar.clipsToBounds=NO

Why not just

- (void)drawRect:(CGRect)rect {
    double progress = MIN(1, MAX(0, self.progress));

    [self.progressBackgroundImage drawInRect:rect];

    CGRect progressFrame = rect;
    progressFrame.size.width = round(rect.size.width * progress);

    [self.progressImage drawInRect:progressFrame];
}

and not subclass UIProgressView?

Hi,
I have been searching for the same solution for a long time, thanks. Can i make progress view round cornered at the corners.