Using a NSString to set a color for a label

问题

I want to create a method and use a string value "redColor" to set the UIColor for a label. tableColorName is the NSString "redColor" and I tried to apply a selector to create the UIColor and apply it to my textLabel. Thanks

-(void) changeLabelColor
{
    SEL labelColor = NSSelectorFromString([NSString stringWithFormat:[@"%@", tableColorName]]);

    UIColor *color = [[UIColor class] performSelector:labelColor];
    self.textLabel.textColor = color;
}

回答1:

Use this method

-(UIColor *)giveColorfromStringColor:(NSString *)colorname
{
    SEL labelColor = NSSelectorFromString(colorname);
    UIColor *color = [UIColor performSelector:labelColor];
    return color;
}

Call as

[view setBackgroundColor:[self giveColorfromStringColor:@"redColor"]];

The method name takes colorname as input and gives the corresponding UIColor

Thus in your case the call will be

self.textLabel.textColor = [self giveColorfromStringColor:@"redColor"];

来源：https://stackoverflow.com/questions/15456299/using-a-nsstring-to-set-a-color-for-a-label