我有一个名为theImageView的UIImageView, UIImage是单色的(透明背景),就像下面左边的黑色心形。我如何在iOS 7或更高的系统中,根据iOS 7+导航栏图标中使用的色调方法,以编程方式更改此图像的色调颜色?
这个方法也适用于WatchKit的Apple Watch应用程序吗?
我有一个名为theImageView的UIImageView, UIImage是单色的(透明背景),就像下面左边的黑色心形。我如何在iOS 7或更高的系统中,根据iOS 7+导航栏图标中使用的色调方法,以编程方式更改此图像的色调颜色?
这个方法也适用于WatchKit的Apple Watch应用程序吗?
当前回答
子类,也可以从代码和接口生成器中使用:
@implementation TintedImageView
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self setup];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
[self setup];
}
return self;
}
-(void)setup {
self.image = [self.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
}
@end
其他回答
这里有一个类别应该可以做到这一点
@interface UIImage(Overlay)
@end
@implementation UIImage(Overlay)
- (UIImage *)imageWithColor:(UIColor *)color1
{
UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(context, 0, self.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextSetBlendMode(context, kCGBlendModeNormal);
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
CGContextClipToMask(context, rect, self.CGImage);
[color1 setFill];
CGContextFillRect(context, rect);
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
@end
所以你会这样做:
theImageView.image = [theImageView.image imageWithColor:[UIColor redColor]];
利用Swift中的扩展:-
extension UIImageView {
func changeImageColor( color:UIColor) -> UIImage
{
image = image!.withRenderingMode(.alwaysTemplate)
tintColor = color
return image!
}
}
//Change color of logo
logoImage.image = logoImage.changeImageColor(color: .red)
自iOS 13以来,UIImage有一个原生方法
let image = yourImage.withTintColor(.systemRed)
你可以在Swift 3中使用它,如果你有一个图像来替换清除按钮
func addTextfieldRightView(){
let rightViewWidth:CGFloat = 30
let viewMax = self.searchTxt.frame.height
let buttonMax = self.searchTxt.frame.height - 16
let buttonView = UIView(frame: CGRect(
x: self.searchTxt.frame.width - rightViewWidth,
y: 0,
width: viewMax,
height: viewMax))
let myButton = UIButton(frame: CGRect(
x: (viewMax - buttonMax) / 2,
y: (viewMax - buttonMax) / 2,
width: buttonMax,
height: buttonMax))
myButton.setImage(UIImage(named: "BlueClear")!, for: .normal)
buttonView.addSubview(myButton)
let clearPressed = UITapGestureRecognizer(target: self, action: #selector(SearchVC.clearPressed(sender:)))
buttonView.isUserInteractionEnabled = true
buttonView.addGestureRecognizer(clearPressed)
myButton.addTarget(self, action: #selector(SearchVC.clearPressed(sender:)), for: .touchUpInside)
self.searchTxt.rightView = buttonView
self.searchTxt.rightViewMode = .whileEditing
}
用于着色UIButton的图像
let image1 = "ic_shopping_cart_empty"
btn_Basket.setImage(UIImage(named: image1)?.withRenderingMode(.alwaysTemplate), for: .normal)
btn_Basket.setImage(UIImage(named: image1)?.withRenderingMode(.alwaysTemplate), for: .selected)
btn_Basket.imageView?.tintColor = UIColor(UIColor.Red)