-boundingRectWithSize:options:attributes:context:用法

导入第三方一些类库后,出现一些警告就是某些方法被弃用了:

如:

- (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,一半为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;

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