顏色範例程式碼

#import "ViewController.h"

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UISlider *red;//Slider的IBoutlet
@property (weak, nonatomic) IBOutlet UISlider *blue;//Slider的IBoutlet
@property (weak, nonatomic) IBOutlet UISlider *green;//Slider的IBoutlet
@property (weak, nonatomic) IBOutlet UILabel *redLabel;//Label的IBoutlet
@property (weak, nonatomic) IBOutlet UILabel *blueLabel;//Label的IBoutlet
@property (weak, nonatomic) IBOutlet UILabel *greenLabel;//Label的IBoutlet

@end

@implementation ViewController

- (IBAction)colorChange:(UISlider *)sender {
    float red=self.red.value;
    float blue=self.blue.value;
    float green=self.green.value;


    _redLabel.text=[NSString stringWithFormat:@"Red:%.0f",red];

    _blueLabel.text=[NSString stringWithFormat:@"Blue:%.0f",blue];

    _greenLabel.text=[NSString stringWithFormat:@"Green:%.0f",green];

    UIColor * color = [UIColor colorWithRed:red/255.0 green:green/255.0 blue:blue/255.0 alpha:1];

    self.view.backgroundColor=color;

}


@end