iOS系统弃用方法更新方法

-boundingRectWithSize:options:attributes:context:用法

- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(NSLineBreakMode)lineBreakModeNS_DEPRECATED_IOS(2_0,7_0,"Use -boundingRectWithSize:options:attributes:context:");

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

这个方法:

- (CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options attributes:(NSDictionary *)attributes context:(NSStringDrawingContext *)context

几个参数:

size:范围自己决定

options :这是一个枚举类型

typedefNS_ENUM(NSInteger, NSStringDrawingOptions) {

    NSStringDrawingTruncatesLastVisibleLine = 1 << 5, 

    NSStringDrawingUsesLineFragmentOrigin = 1 <<0,

    NSStringDrawingUsesFontLeading = 1 <<1, 

    NSStringDrawingUsesDeviceMetrics = 1 <<3, 

} NS_ENUM_AVAILABLE_IOS(6_0);

自己选一个适合的

attributes:字典

NSDictionary *attributes = @{NSFontAttributeName:[UIFontsystemFontOfSize:20]};

context:文本绘制的规范定义,一般为nil就可以。

替换后:

NSDictionary *attributes = @{NSFontAttributeName:[UIFontsystemFontOfSize:20]};
CGSize textSize = [@"字符串" boundingRectWithSize:CGSizeMake(100, 100) options:NSStringDrawingTruncatesLastVisibleLine attributes:attributes context:nil].size;

drawInRect: withAttributes: 新方法的使用

- (CGSize)drawInRect:(CGRect)rect withFont:(UIFont *)font lineBreakMode:(NSLineBreakMode)lineBreakMode alignment:(NSTextAlignment)alignment NS_DEPRECATED_IOS(2_0, 7_0, "Use -drawInRect:withAttributes:"

drawInRect: withAttributes:

- (void)drawInRect:(CGRect)rect withAttributes:(nullable NSDictionary<NSString *, id> *)attrs NS_AVAILABLE(10_0, 7_0);

之前的用法

[self.placeHolder drawInRect:placeHolderRect
                                withFont:self.font
                           lineBreakMode:NSLineBreakByTruncatingTail
                               alignment:self.textAlignment];

7.0以后

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}];