[英]How to get RGB color value from UISlider
我已經嘗試過這段代碼,但工作不正常。在UISlider的值變化中,我調用了這個方法......
@property (strong, nonatomic) IBOutlet UISlider *r;
@property (strong, nonatomic) IBOutlet UISlider *g;
@property (strong, nonatomic) IBOutlet UISlider *b;
@property (strong, nonatomic) IBOutlet UILabel *colorLabel;
- (void)viewDidLoad
{
[super viewDidLoad];
_r.minimumValue=0;
_r.maximumValue=255;
_g.minimumValue=0;
_g.maximumValue=255;
_b.minimumValue=0;
_b.maximumValue=255;
// Do any additional setup after loading the view, typically from a nib.
}
-(void)sliderValueChanged:(UISlider*)slider
{
[_colorLabel setBackgroundColor:[UIColor colorWithRed:_r.value green:_g.value blue:_b.value alpha:1]];
}
請幫助,如果有人有一些想法..
UIColor
方法將每個組件參數的范圍設置為0 to 1
,因此您需要在傳遞它們之前將滑塊值除以255.0
。
試試這個(忽略alpha滑塊,這是我自己對類似任務的實際解決方案):
保持心情:讓你的滑塊從0變為1,以避免分裂到255。
.h文件:
IBOutlet UISlider *rSlider;
IBOutlet UISlider *gSlider;
IBOutlet UISlider *bSlider;
.m文件
-(void)blueSlider:(id)sender
{
bSlider = (UISlider *)sender;
UIColor *newColor = [UIColor colorWithRed:rSlider.value green:gSlider.value blue:bSlider.value alpha:alphaSlider.value];
colorView.backgroundColor = newColor;
}
-(void)greenSlider:(id)sender
{
gSlider = (UISlider *)sender;
UIColor *newColor = [UIColor colorWithRed:rSlider.value green:gSlider.value blue:bSlider.value alpha:alphaSlider.value];
colorView.backgroundColor = newColor;
}
-(void)redSlider:(id)sender
{
rSlider = (UISlider *)sender;
UIColor *newColor = [UIColor colorWithRed:rSlider.value green:gSlider.value blue:bSlider.value alpha:alphaSlider.value];
colorView.backgroundColor = newColor;
}
使用您的設置顏色方法
-(void)sliderValueChanged:(UISlider*)slider
{
float r=[[NSString stringWithFormat:@"%.0f",_r.value] floatValue];
float g=[[NSString stringWithFormat:@"%.0f",_g.value]floatValue];
float b=[[NSString stringWithFormat:@"%.0f",_b.value]floatValue];
UIColor *colorToSet=[UIColor colorWithRed:(r/255.0f) green:(g/255.0f) blue:(b/255.0f) alpha:1];
[_colorLabel setBackgroundColor:colorToSet];
}
對於你的Exothug
如果滑塊值僅從0到1
-(IBAction)sliderValue:(UISlider*)sender
{
UIColor *newColor = [UIColor colorWithRed:rSlider.value green:gSlider.value blue:bSlider.value alpha:1];
_colorLabel.backgroundColor = newColor;
}
現在在ViewCotroller中
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