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计算文本高度
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- (CGFloat)heighWithFont:(UIFont *)font constrainedToSize:(CGSize)size | |
{ | |
return [self sizeWithFont:font constrainedToSize:size].height; | |
} | |
- (CGFloat)widthWithFont:(UIFont *)font constrainedToSize:(CGSize)size | |
{ | |
return [self sizeWithFont:font constrainedToSize:size].width; | |
} | |
- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size | |
{ | |
CGRect stringRect; | |
if ([self respondsToSelector:@selector(boundingRectWithSize:options:attributes:context:)]) { | |
stringRect = [self boundingRectWithSize:size | |
options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading | |
attributes:@{NSFontAttributeName: font} | |
context:NULL]; | |
} else { | |
CGSize stringSize = [self sizeWithFont:font constrainedToSize:size]; | |
stringRect = CGRectMake(0, 0, stringSize.width, stringSize.height); | |
} | |
return stringRect.size; | |
} |
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