Question

我想知道如何将UIColor的名称传递给特定的方法？

编辑：

- (id) setLabel:(NSString *)text WithColorName:(NSString *)nameOfColor FontName:(NSString *)f_name FontSize:(float)f_size abel:(UILabel *)templbl
{
  templbl.backgroundColor = [UIColor ?????];

return templbl;

}

有什么建议吗？

谢谢..

Answer 1

NSString *colorStr = @"magenta";

NSString *selectorString = [colorStr stringByAppendingString:@"Color"];
SEL selector = NSSelectorFromString(selectorString);
UIColor *color = [UIColor blackColor];
if ([UIColor respondsToSelector:selector]) {
    color = [UIColor performSelector:selector];
}

Answer 2

- (id) setLabel:(NSString *)text WithColorName:(NSString *)nameOfColor FontName:(NSString *)f_name FontSize:(float)f_size abel:(UILabel *)templbl color:(UIColor*) myLabelColor
{
  templbl.backgroundColor = myLabelColor;
  return templbl;
}

Answer 3

一个选项是字典，其中名称是键，颜色是值

Answer 4

您可以动态调用颜色类方法：

- (id) setLabel:(NSString *)text WithColorName:(NSString *)nameOfColor FontName:(NSString *)f_name FontSize:(float)f_size abel:(UILabel *)templbl
{

    SEL colorMethod = NSSelectorFromString([NSString stringWithFormat:@"%@Color", [nameOfColor lowercaseString]]);

    // Check if this is a valid color first
    if ([[UIColor class] respondsToSelector:colorMethod]) {

        // Dynamically invoke the class method
        UIColor *color = [[UIColor class] performSelector:colorMethod];
        templbl.backgroundColor = color;
    }

}

Answer 5

Jhaliya的答案会起作用，实际上并不是你所要求的（在你的例子中你不想传递UIColor作为参数，你只想传递它的预设字符串名称。

这有点棘手，因为[UIColor redColor]之类的东西是方法，而不是字符串参数。您必须使用NSSelectorFromString来实现它。正如Jhaliya的答案所示，更好地传递UIColor。

我怎么能传递UIColor的名字

5 个答案: