嗨,我无法编写一个自定义方法,通过将字符串、int 和颜色作为参数传递来为 NSMutableAttributeString 添加属性,我在下面收到三个错误,请帮助。.
-(NSMutableAttributedString*)setAttributedSuits: (NSString*) suitString
setwidth:(id)strokeWidth
setColor:(id)strokeColor{
NSMutableAttributedString* attributeSuits = [[NSMutableAttributedString alloc]initWithString:suitString];
if ([strokeWidth isKindOfClass:[NSString class]]&&[strokeWidth isKindOfClass:[UIColor class]]) // error 1 - use of undeclared identifier "UIColor", did you mean '_color'?
{
[attributeSuits addAttributes:@{NSStrokeWidthAttributeName:strokeWidth, // error 2 - use of undeclared identifier "NSStrokeWidthAttributeName"
NSStrokeColorAttributeName:strokeColor} //// error 3 - use of undeclared identifier "NSStrokeColorAttributeName"
range:NSMakeRange(0, suitString.length)];
}
return attributeSuits;
}
所有给你错误的三个符号都来自UIKit。因此,这意味着您不会在 .m 文件的顶部导入 UIKit。
添加任一
#import <UIKit/UIKit.h>
或
@import UIKit;
到 .m 文件的顶部。
您将id
用于strokeWidth
和strokeColor
也是没有意义的。而且看看strokeWidth
是否是NSString
就更没有意义了.特别是因为NSStrokeWidthAttributeName
键期望NSNumber
.我强烈建议您将代码更改为如下所示:
- (NSMutableAttributedString *)setAttributedSuits:(NSString *)suitString width:(CGFloat)strokeWidth color:(UIColor *)strokeColor {
NSDictionary *attributes = @{
NSStrokeWidthAttributeName : @(strokeWidth),
NSStrokeColorAttributeName : strokeColor
};
NSMutableAttributedString *attributeSuits = [[NSMutableAttributedString alloc] initWithString:suitString attributes:attributes];
return attributeSuits;
}
当然,您需要更新 .h 文件中的声明以匹配。