如何在ios中为我的应用程序设置页面中的一个按钮更改所有屏幕的背景颜色或主题,使用objectve c

Question

我已经viewDidLoad:在我的tableview控制器中尝试过了,但是只更改了那个屏幕,我需要更改我的所有屏幕.

self.myTableView.backgroundColor = [UIColor purpleColor];
myTableView.opaque = NO;

Answer 1

1.

• 创建一个名为的Singleton类Settings
• 拥有色彩属性
• 创建一个BaseViewController并让所有ViewControllers继承自此BaseViewController.
• 设置背景颜色viewDidLoad:或viewWillAppear:你的BaseViewController.

例如:

//Settings.h
@interface Settings : NSObject

+ (Settings *)sharedSettings;

@property(nonatomic, strong) UIColor *themeColor

@end

//Settings.m
+(Settings *)sharedSettings {

    static Settings *sharedSettings = nil;
    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{
        sharedSettings = [[self alloc] init];
    });

    return sharedSettings;
}

//BaseViewController.m
#import "Settings.h"

...

- (void)viewDidLoad {

    [super viewDidLoad];
    [self.view setBackgroundColor:[Settings sharedSettings].themeColor];
}

2.

还有另一种方法可以实现这一点,即通知设计模式

每当您更改设置中的颜色时,都会发送通知并在您的通知中接收该通知BaseViewController.

//Settings.m
- (void)colorChanged:(UIColor *)color {
    [[NSNotificationCenter defaultCenter] postNotificationName:@"ThemeColorChanged" object:color];
}

//BaseViewController.m

- (void)viewDidLoad {

    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(@"notificationThemeColorChanged:") name:@"ThemeColorChanged" object:nil];
}

- (void)notificationThemeColorChanged:(NSNotification *)notification {

    UIColor *changedColor = notification.object;
    [self.view setBackgroundColor:changedColor];
}

为了节省

如果您需要保存数据,以便每当用户返回应用程序时,他会看到上次更新的颜色,然后您可以将其保存到UserDefaults.

//Settings.h
@interface Settings : NSObject

+ (Settings *)sharedSettings;

@property(nonatomic, strong) UIColor *themeColor

@end

//Settings.m
+(Settings *)sharedSettings {

    static Settings *sharedSettings = nil;
    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{
        sharedSettings = [[self alloc] init];
    });

    return sharedSettings;
}

- (instancetype)init {

    if(self = [super init]) {

        UIColor *savedColor = [[NSUserDefaults standardUserDefaults] objectForKey:@"ThemeColor"];
        if(savedColor) {
            self.themeColor = savedColor;
        } else {
            self.themeColor = defaultColor; //Ex:[UIColor whiteColor];
        }
    }
    return self;
}

- (void)colorChanged:(UIColor *)color {

    [[NSUserDefaults standardUserDefaults] setObject:color forKey:@"ThemeColor"];
    [[NSUserDefaults standardUserDefaults] synchronize];
}