5_CustomTableViewCell/CustomTableViewCell/APLTimeZoneView.m

 
/*
     File: APLTimeZoneView.m
 Abstract: A simple view to display various pieces of information about a time zone. Because the the view's content is fairly complex, it draws its content directly in drawRect: to optimize scolling performance.
 The implementation is very basic -- it doesn't attempt to constrain text to particular areas to aviod overlapping and so on. It does, though, illustrate response to highlighting.
 
  Version: 3.0
 
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 */
 
#import "APLTimeZoneView.h"
#import "APLTimeZoneWrapper.h"
 
 
NSUInteger DeviceSystemMajorVersion();
 
@interface APLTimeZoneView ()
@property (nonatomic) NSDateFormatter *dateFormatter;
@end
 
 
@implementation APLTimeZoneView
 
- (void)setTimeZoneWrapper:(APLTimeZoneWrapper *)newTimeZoneWrapper {
    
    // If the time zone wrapper changes, update the date formatter and abbreviation string.
    if (_timeZoneWrapper != newTimeZoneWrapper) {
        _timeZoneWrapper = newTimeZoneWrapper;
        
        [self.dateFormatter setTimeZone:_timeZoneWrapper.timeZone];
        
        self.abbreviation = [[NSString alloc] initWithFormat:@"%@ (%@)", _timeZoneWrapper.abbreviation, _timeZoneWrapper.gmtOffset];
    }
    // May be the same wrapper, but the date may have changed, so mark for redisplay.
    [self setNeedsDisplay];
}
 
 
- (void)setHighlighted:(BOOL)lit {
    // If highlighted state changes, need to redisplay.
    if (_highlighted != lit) {
        _highlighted = lit;
        [self setNeedsDisplay];
    }
}
 
 
- (void)drawRect:(CGRect)rect {
    
#define LEFT_COLUMN_OFFSET 10
#define MIDDLE_COLUMN_OFFSET 170
#define RIGHT_COLUMN_OFFSET 270
    
#define UPPER_ROW_TOP 12
#define LOWER_ROW_TOP 44
 
    // Color for the main text items (time zone name, time).
    UIColor *mainTextColor;
 
    // Color for the secondary text items (GMT offset, day).
    UIColor *secondaryTextColor;
 
    // Choose font color based on highlighted state.
    if (self.highlighted) {
        mainTextColor = [UIColor whiteColor];
        secondaryTextColor = [UIColor whiteColor];
    }
    else {
        mainTextColor = [UIColor blackColor];
        secondaryTextColor = [UIColor darkGrayColor];
    }
 
    /*
     Font attributes for the main text items (time zone name, time).
     For iOS 7 and later, use text styles instead of system fonts.
     */
    UIFont *mainFont;
    if (DeviceSystemMajorVersion() > 6) {
        mainFont = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
    }
    else {
        mainFont = [UIFont systemFontOfSize:17.0];
    }
    
    NSDictionary *mainTextAttributes = @{ NSFontAttributeName : mainFont, NSForegroundColorAttributeName : mainTextColor };
 
    // Font attributes for the secondary text items (GMT offset, day).
    UIFont *secondaryFont;
    if (DeviceSystemMajorVersion() > 6) {
        secondaryFont = [UIFont preferredFontForTextStyle:UIFontTextStyleCaption1];
    }
    else {
        secondaryFont = [UIFont systemFontOfSize:12.0];
    }
    NSDictionary *secondaryTextAttributes = @{ NSFontAttributeName : secondaryFont, NSForegroundColorAttributeName : secondaryTextColor };
    
 
    // In this example we will never be editing, but this illustrates the appropriate pattern.
    if (!self.editing) {
 
        CGPoint point;
        
        /*
         Draw the locale name top left.
        */
        NSAttributedString *localeNameAttributedString = [[NSAttributedString alloc] initWithString:self.timeZoneWrapper.localeName attributes:mainTextAttributes];
        point = CGPointMake(LEFT_COLUMN_OFFSET, UPPER_ROW_TOP);
        [localeNameAttributedString drawAtPoint:point];
 
        /*
         Draw the current time in the middle column.
         */
        NSString *timeString = [self.dateFormatter stringFromDate:[NSDate date]];
        NSAttributedString *timeAttributedString = [[NSAttributedString alloc] initWithString:timeString attributes:mainTextAttributes];
        point = CGPointMake(MIDDLE_COLUMN_OFFSET, UPPER_ROW_TOP);
        [timeAttributedString drawAtPoint:point];
        
        /*
         Draw the abbreviation botton left.
         */
        NSAttributedString *abbreviationAttributedString = [[NSAttributedString alloc] initWithString:self.abbreviation attributes:secondaryTextAttributes];
        point = CGPointMake(LEFT_COLUMN_OFFSET, LOWER_ROW_TOP);
        [abbreviationAttributedString drawAtPoint:point];
 
        /*
         Draw the whichDay string.
         */
        APLTimeZoneWrapper *timeZoneWrapper = self.timeZoneWrapper;
 
        NSAttributedString *whichDayAttributedString = [[NSAttributedString alloc] initWithString:timeZoneWrapper.whichDay attributes:secondaryTextAttributes];
        point = CGPointMake(MIDDLE_COLUMN_OFFSET, LOWER_ROW_TOP);
        [whichDayAttributedString drawAtPoint:point];
 
        
        // Draw the quarter image.
        CGFloat imageY = (self.bounds.size.height - self.timeZoneWrapper.image.size.height) / 2;
        
        point = CGPointMake(RIGHT_COLUMN_OFFSET, imageY);
        [timeZoneWrapper.image drawAtPoint:point];
    }
}
 
 
-(NSDateFormatter *)dateFormatter
{
    if (!_dateFormatter) {
        _dateFormatter = [[NSDateFormatter alloc] init];
        NSString *dateFormat = [NSDateFormatter dateFormatFromTemplate:@"h:mm a" options:0 locale:[NSLocale currentLocale]];
        [_dateFormatter setDateFormat:dateFormat];
    }
    return _dateFormatter;
}
 
@end
 
 
NSUInteger DeviceSystemMajorVersion() {
    static NSUInteger _deviceSystemMajorVersion = -1;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _deviceSystemMajorVersion = [[[[[UIDevice currentDevice] systemVersion] componentsSeparatedByString:@"."] objectAtIndex:0] integerValue];
    });
    return _deviceSystemMajorVersion;
}