我的应用程序有一个带有图像按钮的工具栏(UIButton 的子类);当用户打开“粗体文本”辅助功能选项时,不仅文本会变成粗体,图像也会随之变粗。
这是正常模式下的工具栏:
启用“粗体文本”时:
这似乎是由我的 UIButton 子类引起的,它包含在下面。我正在使用此类在单击、禁用按钮等时应用图像色调颜色,并避免必须包含每个按钮的多个状态。为此,我使用了 UIImageRenderingModeAlwaysTemplate
reportedly表现出这种观察到的行为。
我试图取消选中界面生成器中的“辅助功能”选项,但这根本没有效果。有办法解决这个问题吗?
#import "AppButton.h"
@implementation AppButton
- (id)initWithCoder:(NSCoder *)aDecoder
{
if (self = [super initWithCoder:aDecoder]) {
[self initialize];
}
return self;
}
- (void)initialize
{
self.adjustsImageWhenHighlighted = NO;
[self setImage:[[self imageForState:UIControlStateNormal] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate] forState:UIControlStateNormal];
}
- (void)updateButtonView
{
if (!self.enabled) {
self.imageView.tintColor = [UIColor colorWithRGBValue:RGBValueC9];
} else if (self.highlighted) {
self.imageView.tintColor = self.highlightTintColor;
} else {
self.imageView.tintColor = self.tintColor;
}
}
- (void)setHighlighted:(BOOL)highlighted
{
[super setHighlighted:highlighted];
[self updateButtonView];
}
- (void)setEnabled:(BOOL)enabled
{
[super setEnabled:enabled];
[self updateButtonView];
}
- (void)setTintColor:(UIColor *)tintColor
{
[super setTintColor:tintColor];
[self updateButtonView];
}
@end
最佳答案
我建议您使用自定义类别来为图像按钮着色。这是一个简单的实现:
UIImage+TintImage.h
@interface UIImage (TintImage)
- (UIImage *)imageTintedWithColor:(UIColor *)tintColor;
@end
UIImage+TintImage.m
#import "UIImage+TintImage.h"
@implementation UIImage (TintImage)
- (UIImage *)imageTintedWithColor:(UIColor *)tintColor
{
if (tintColor == nil) {
tintColor = [UIColor whiteColor];
}
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);
// Tint image
[tintColor set];
UIRectFill(rect);
[self drawInRect:rect blendMode:kCGBlendModeDestinationIn alpha:1.0f];
UIImage *tintedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return tintedImage;
}
@end
要使用它,只需导入"UIImage+TintImage.h"
,然后执行以下操作:
UIImage *originalImage = [UIImage imageNamed:@"icn-menu"];
UIImage *tintedImage = [originalImage imageTintedWithColor:[UIColor blueColor]];
UIButton *homeButton = [UIButton buttonWithType:UIButtonTypeCustom];
[homeButton setImage:originalImage forState:UIControlStateNormal];
[homeButton setImage:tintedImage forState:UIControlStateHighlighted];
关于ios - 如何使用 UIImage RenderingMode AlwaysTemplate 防止粗体图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28935349/