-boundingRectWithSize:options:attributes:context:用法

原文链接:http://www.th7.cn/Program/IOS/201502/386995.shtml

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:[UIFont systemFontOfSize: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;