iOS-文本自适应宽高废弃方法更新

Posted 2021-12-09 MinggeQingchun

1、-boundingRectWithSize:options:attributes:context:用法

- (CGSize)sizeWithFont:(UIFont *)font forWidth:(CGFloat)width lineBreakMode:(NSLineBreakMode)lineBreakMode API_DEPRECATED_WITH_REPLACEMENT("boundingRectWithSize:options:attributes:context:", ios(2.0, 7.0)) API_UNAVAILABLE(tvos);

提示用:boundingRectWithSize:options:attributes:context:这个方法

- (CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options attributes:(nullable NSDictionary<NSAttributedStringKey, id> *)attributes context:(nullable NSStringDrawingContext *)context API_AVAILABLE(macos(10.11), ios(7.0));

使用

    //之前用法
    CGSize titleSize = [title sizeWithFont:font forWidth:200 lineBreakMode:kLineYardsBreakMode];

    //当前用法
    CGFloat textWide = 200;//设置文字可显示宽度
    CGSize size = CGSizeMake(textWide,CGFLOAT_MAX);
    NSMutableParagraphStyle *textStyle = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy];
    textStyle.lineBreakMode = NSLineBreakByTruncatingTail;
//    textStyle.alignment = self.textAlignment;
    //获取当前文本的属性
    NSDictionary * dic = [NSDictionary dictionaryWithObjectsAndKeys:font,NSFontAttributeName,textStyle,NSParagraphStyleAttributeName,nil];
    CGSize titleSize = [title boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;

2、drawInRect: withAttributes:用法

- (CGSize)drawInRect:(CGRect)rect withFont:(UIFont *)font lineBreakMode:(NSLineBreakMode)lineBreakMode API_DEPRECATED_WITH_REPLACEMENT("drawInRect:withAttributes:", ios(2.0, 7.0)) API_UNAVAILABLE(tvos);

提示用drawInRect: withAttributes:方法

- (void)drawInRect:(CGRect)rect withAttributes:(nullable NSDictionary<NSAttributedStringKey, id> *)attrs API_AVAILABLE(macos(10.0), ios(7.0));

使用

//之前用法
[self.placeHolder drawInRect:placeHolderRect
                    withFont:self.font
               lineBreakMode:NSLineBreakByTruncatingTail
                   alignment:self.textAlignment];

//最新用法
NSMutableParagraphStyle *textStyle = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy];
textStyle.lineBreakMode = NSLineBreakByTruncatingTail;
textStyle.alignment = self.textAlignment;
UIFont *textFont = self.font;
            
[self.placeHolder drawInRect:placeHolderRect withAttributes:@{NSFontAttributeName:textFont, NSParagraphStyleAttributeName:textStyle}];