从Plist中检索颜色。 iOS版

时间:2015-02-23 13:14:24

标签: ios xcode dictionary plist uicolor

我正在尝试从字典中的plist中检索UIColor但是在执行此操作时遇到了一些麻烦。

我将我的UIColors在我的plist中添加到字典中,然后添加到字符串中。 (见附图)

我正在我的plist中保存它们:

[UIColor colorWithRed:57/255.0 green:131/255.0 blue:50/255.0 alpha:1]

然后我有一个文件,我保存所有颜色,如:

+ (instancetype)titleBarColor
{
return [UIColor colorWithRed:57/255.0 green:131/255.0 blue:50/255.0 alpha:1];
}

但是我想做点什么:

+ (instancetype)titleBarColor
{

NSBundle* settings = [NSBundle mainBundle];
NSMutableDictionary *testing = [settings objectForInfoDictionaryKey: @"appColours"];
UIColor *test = [testing objectForKey:@"titleBarColor"];
NSLog(@"Test Colour %@", test);
return test;
}

但显然是由于字符串拾取颜色而导致崩溃。

2 个答案:

答案 0 :(得分:3)

我将它们存储为十六进制值,然后使用以下内容检索:

+ (UIColor *)colorFromHexString:(NSString *)hexString andAlpha:(CGFloat)alpha {

    //If non valid string:
    if (!hexString)
        return nil;

    unsigned rgbValue = 0;
    NSScanner *scanner = [NSScanner scannerWithString:hexString];
    [scanner setScanLocation:1]; // bypass '#' character
    [scanner scanHexInt:&rgbValue];
    return [UIColor colorWithRed:((rgbValue & 0xFF0000) >> 16)/255.0 green:((rgbValue & 0xFF00) >> 8)/255.0 blue:(rgbValue & 0xFF)/255.0 alpha:alpha];
}

或者只是保存用逗号分隔的浮点值并将其解析出来。有一些解决方案......

答案 1 :(得分:0)

这是CW0007007的Swift 3 / iOS 10版本的答案:

extension UIColor{
    static func colorFrom(hexString:String, alpha:CGFloat = 1.0)->UIColor{
        var rgbValue:UInt32 = 0
        let scanner = Scanner(string: hexString)
        scanner.scanLocation = 1 // bypass # character
        scanner.scanHexInt32(&rgbValue)
        let red = CGFloat((rgbValue & 0xFF0000) >> 16)/255.0
        let green = CGFloat((rgbValue & 0x00FF00) >> 8)/255.0
        let blue = CGFloat((rgbValue & 0x0000FF) >> 8)/255.0
        return UIColor(red: red, green: green, blue: blue, alpha: alpha)
    }
}