iphone - 如何获取 UIFont 实例的字体大小或粗体版本

Question

如何获取 UIFont 实例的字体大小？

或者，如果有人可以为 UIFont 实现这个方法？

- (UIFont *)boldFont;

Answer 1

这是一个旧答案，不再是最佳解决方案，请改为查看已接受的答案。

-(UIFont *)boldFont{

//First get the name of the font (unnecessary, but used for clarity)
NSString *fontName = self.fontName;

//Some fonts having -Regular on their names. so we have to remove that before append -Bold / -BoldMT
fontName = [[fontName componentsSeparatedByString:@"-"] firstObject];

//Then append "-Bold" to it.
NSString *boldFontName = [fontName stringByAppendingString:@"-Bold"];

//Then see if it returns a valid font
UIFont *boldFont = [UIFont fontWithName:boldFontName size:self.pointSize];

//If it's valid, return it
if(boldFont) return boldFont;

//Seems like in some cases, you have to append "-BoldMT"
boldFontName = [fontName stringByAppendingString:@"-BoldMT"];
boldFont = [UIFont fontWithName:boldFontName size:self.pointSize];

//Here you can check if it was successful, if it wasn't, then you can throw an exception or something.
return boldFont;

}