計(jì)算一行文本的高度

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說(shuō)明

有時(shí)候我們需要知道指定的幾行文本的高度，此工具用于解決此種問(wèn)題。

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源碼

// // NSString+LabelWidthAndHeight.h // ZiPeiYi // // Created by YouXianMing on 15/12/9. // Copyright ? 2015年 YouXianMing. All rights reserved. // #import <Foundation/Foundation.h> #import <UIKit/UIKit.h>@interface NSString (LabelWidthAndHeight)/*** Get the string's height with the fixed width.** @param attribute String's attribute, eg. attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:18.f]}* @param width Fixed width.** @return String's height.*/ - (CGFloat)heightWithStringAttribute:(NSDictionary <NSString *, id> *)attribute fixedWidth:(CGFloat)width;/*** Get the string's width.** @param attribute String's attribute, eg. attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:18.f]}** @return String's width.*/ - (CGFloat)widthWithStringAttribute:(NSDictionary <NSString *, id> *)attribute;/*** Get a line of text height.** @param attribute String's attribute, eg. attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:18.f]}** @return String's width.*/ + (CGFloat)aLineOfTextHeightWithStringAttribute:(NSDictionary <NSString *, id> *)attribute;@end // // NSString+LabelWidthAndHeight.m // ZiPeiYi // // Created by YouXianMing on 15/12/9. // Copyright ? 2015年 YouXianMing. All rights reserved. // #import "NSString+LabelWidthAndHeight.h"@implementation NSString (LabelWidthAndHeight)- (CGFloat)heightWithStringAttribute:(NSDictionary <NSString *, id> *)attribute fixedWidth:(CGFloat)width {NSParameterAssert(attribute);CGFloat height = 0;if (self.length) {CGRect rect = [self boundingRectWithSize:CGSizeMake(width, MAXFLOAT)options:NSStringDrawingTruncatesLastVisibleLine |NSStringDrawingUsesLineFragmentOrigin |NSStringDrawingUsesFontLeadingattributes:attributecontext:nil];height = rect.size.height;}return height; }- (CGFloat)widthWithStringAttribute:(NSDictionary <NSString *, id> *)attribute {NSParameterAssert(attribute);CGFloat width = 0;if (self.length) {CGRect rect = [self boundingRectWithSize:CGSizeMake(MAXFLOAT, 0)options:NSStringDrawingTruncatesLastVisibleLine |NSStringDrawingUsesLineFragmentOrigin |NSStringDrawingUsesFontLeadingattributes:attributecontext:nil];width = rect.size.width;}return width; }+ (CGFloat)aLineOfTextHeightWithStringAttribute:(NSDictionary <NSString *, id> *)attribute {CGFloat height = 0;CGRect rect = [@"One" boundingRectWithSize:CGSizeMake(200, MAXFLOAT)options:NSStringDrawingTruncatesLastVisibleLine |NSStringDrawingUsesLineFragmentOrigin |NSStringDrawingUsesFontLeadingattributes:attributecontext:nil];height = rect.size.height;return height; }@end

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