在iOS应用中为所有UITableViewCells设置背景颜色

Question

What's the easiest way to set the backgroundColor of all UITableViewCell s in an iOS app?

Consider an app that has a relatively large number of UITableViewController subclasses. The background color is specified via a web service. So using the color in each tableViewController is probably not the easiest thing to do.

Perhaps every tableViewCell could inherit a UITableViewCell subclass where the color is set for all derived classes? There might be an easier way.

Answer 1

My recommendation would be a singleton. for example:

@interface ColorThemeSingleton : NSObject
@property (strong, atomic) UIColor *tableViewBackgroundColor;
+(ColorThemeSingleton *)sharedInstance;
@end

and the .m :

#import "ColorThemeSingleton.h"
@implementation ColorThemeSingleton
@synthesize tableViewBackgroundColor = _tableViewBackgroundColor;
+(ColorThemeSingleton *)sharedInstance{
    static ColorThemeSingleton *shared = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        shared = [[ColorThemeSingleton alloc] init];
    });
    return shared;
}
-(id)init{
    if ((self = [super init])){
        _tableViewBackgroundColor = [UIColor whiteColor]; // Default color
    }
    return self;
}
@end

Then just after the if(cell==nil){} in tableView:cellForRowAtIndexPath: you would add:

cell.backgroundColor = [ColorThemeSingleton sharedInstance].tableViewBackgroundColor;

And when you load you color from the web, set the value of the property to the fetched color. The next time a cell runs through tableView:cellForRowAtIndexPath: the color will be the new color.

So basically just add the #import"" and cell.backgroundColor = to the tableView 's dataSource . To me that's a lot better than changing the UITableViewCell 's class on every controller.