如何從帶有標簽和顏色對象的方法中選擇隨機顏色？

Question

嘗試從這三種定義的顏色屬性運行隨機顏色，

int num1 = rand() %3;
color1= [UIColor colorWithRed:0.5/num1 green:0.7/num1 blue:0.5/num1 alpha:1.0];
[self setColor:color1 setLabel:label1];

int num2 = rand() %3;
color2 = [UIColor colorWithRed:0.5/num2 green:0.7/num2 blue:0.5/num2 alpha:1.0];
[self setColor:color2 setLabel:label2];

int num3 = rand() %3;
color3= [UIColor colorWithRed:0.5/num3 green:0.7/num3 blue:0.5/num3 alpha:1.0];
[self setColor:color3 setLabel:label3];

嘗試從顏色對象（標簽對象）生成隨機顏色。

想要為整個顏色變量放置random（），而不僅僅是屬性。 我怎樣才能做到這一點。 提前致謝

Answer 1

您應該隨機更改rgb值...。

color1= [self getRandomColor];                
[self setColor:color1 setLabel:firstColorObject];
color2 = [self getRandomColor];;
[self setColor:color2 setLabel:secondColorObject];
color3= [self getRandomColor];
[self setColor:color3 setLabel:thirdColorObject];

方法定義：

-(UIColor *)getRandomColor{
    UIColor *color;
    float randomRed = rand()%3;//3:you can write any number as you wish...
    float randomGreen =rand()%2;//2:you can write any number as you wish...
    float randomBlue =rand()%4;//4:you can write any number as you wish...
    color= [UIColor colorWithRed:randomRed green:randomGreen blue:randomBlue alpha:1.0];
    return color;
}

Answer 2

編輯：（對於ios）

-(NSDictionary *)randomColorAndLabel{
    UIColor *color1= [UIColor colorWithRed:0.2 green:0.4 blue:0.3 alpha:1.0];
    UIColor *color2= [UIColor colorWithRed:0.3 green:0.4 blue:0.3 alpha:1.0];
    UIColor *color3= [UIColor colorWithRed:0.4 green:0.4 blue:0.3 alpha:1.0];

    NSDictionary *colorDict1=@{@"color1" : color1};
    NSDictionary *colorDict2=@{@"color2" : color2};
    NSDictionary *colorDict3=@{@"color3" : color3};

    NSArray *colors=@[colorDict1, colorDict2, colorDict3];

    NSInteger randomNumber=arc4random()%3;

    return colors[randomNumber];
}

它返回帶有顏色和名稱的字典，您可以將其用於標簽。

---

較早解決OSX

我為OSX解決了問題，使用NSColor代替了UIColor，並且方法名稱更改為

colorWithRed:randomRed green:randomGreen blue:randomBlue alpha:1.0];

-(NSDictionary *)randomColorAndLabel{
    NSColor *color1= [NSColor colorWithCalibratedRed:0.2 green:0.4 blue:0.3 alpha:1.0];
    NSColor *color2 = [NSColor colorWithCalibratedRed:0.3 green:0.4 blue:0.3 alpha:1.0];
    NSColor *color3= [NSColor colorWithCalibratedRed:0.4 green:0.4 blue:0.3 alpha:1.0];

    NSDictionary *colorDict1=@{@"color1" : color1};
    NSDictionary *colorDict2=@{@"color2" : color2};
    NSDictionary *colorDict3=@{@"color3" : color3};

    NSArray *colors=@[colorDict1, colorDict2, colorDict3];

    NSInteger randomNumber=arc4random()%3;

    return colors[randomNumber];
}

這將返回帶有名稱和顏色的字典。

Answer 3

-(UIColor*) randomColor {
    CGFloat r = (float)(arc4random()%256) / 255.f;
    CGFloat g = (float)(arc4random()%256) / 255.f;
    CGFloat b = (float)(arc4random()%256) / 255.f;

    return [UIColor colorWithRed:r green:g blue:b alpha:1.f];

}

Answer 4

Finlay我找到了隨機顏色的解決方案

只需使用下面的代碼

- (UIColor *)getRandomColor {

    srand48(arc4random());

    float red = 0.0;
    while (red < 0.1 || red > 0.84) {
        red = drand48();
    }

    float green = 0.0;
    while (green < 0.1 || green > 0.84) {
        green = drand48();
    }

    float blue = 0.0;
    while (blue < 0.1 || blue > 0.84) {
        blue = drand48();
    }

    return [UIColor colorWithRed:red green:green blue:blue alpha:1.0f];
}

請檢查顏色的參考