创建一个NSString类目
1、计算文字高度
- (CGFloat)heightWithFont:(UIFont *)font fixedWithWidth:(CGFloat)width {
CGRect rect = [self boundingRectWithSize:CGSizeMake(width, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font} context:nil];
return ceil(rect.size.height);
}
2、计算文字宽度
- (CGFloat)widthWithFont:(UIFont *)font fixedWithHeight:(CGFloat)height {
CGRect rect = [self boundingRectWithSize:CGSizeMake(MAXFLOAT, height) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font} context:nil];
return ceil(rect.size.width);
}
