UILabel的富文本属性和计算高度
注：新添加一个富文本方法，在文字只有一行的时候，取消行间距！
把下面两个方法随便放到一个公共的文件里，在.h声明这两个方法的方法名，在.m中粘如下面两个方法,需要的时候只需要导入头文件,就可以设置富文本属性,和计算富文本的高度
/**
- 富文本
- @param string 文本
- @param font 字体
- @param lineSpacing 行高
- @param lineHeightMultiple 行间距（1.5倍）
- @param lineBreakMode 段落样式
- @return
*/
+ (NSMutableAttributedString *)getAttributedString:(NSString *)string font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode{
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing = lineSpacing;
paragraphStyle.lineHeightMultiple = lineHeightMultiple;
paragraphStyle.lineBreakMode = lineBreakMode;
NSDictionary *cyZoneDocAttribute = @{NSFontAttributeName:font,NSParagraphStyleAttributeName: paragraphStyle,NSForegroundColorAttributeName:[UIColor blackColor]};
[attributedString addAttributes:cyZoneDocAttribute range:NSMakeRange(0, [string length])];
return attributedString;
}
/**
-
计算文本高度
-
@param text 文本
-
@param limitW 文本宽度
-
@param font 字体
-
@param lineSpacing 行高
-
@param lineHeightMultiple 行间距
-
@param lineBreakMode 段落样式
-
@return
*/
+ (CGSize)calculateSizeWithText:(NSString *)text limitWidth:(CGFloat)limitW font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode{NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; paragraphStyle.lineSpacing = lineSpacing; paragraphStyle.lineHeightMultiple = lineHeightMultiple; paragraphStyle.lineBreakMode = lineBreakMode; NSDictionary *cyZoneDocAttribute = @{NSFontAttributeName:font,NSParagraphStyleAttributeName: paragraphStyle}; CGSize size; size = [text boundingRectWithSize:CGSizeMake(limitW, MAXFLOAT) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:cyZoneDocAttribute context:nil].size; return size; }
注：对之前的方法进行修改，因为设置富文本的属性的时候可能出现只有一行文字，还出现行间距，这样会让我们的约束特别的困难，新增加一个方法，在设置富文本属性的时候多传入一个宽度，确保在只有一行文字的时候，不会有行间距，方法如下：
/**
-
富文本
-
@param string 文本
-
@param font 字体
-
@param lineSpacing 行高
-
@param lineHeightMultiple 行间距（1.5倍）
-
@param lineBreakMode 段落样式
-
@param limitWith 文本宽度
-
@return
*/
+ (NSMutableAttributedString *)getAttributedStringWithString:(NSString *)string font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode limitWith:(CGFloat)limitWith{
if (string == nil) {
return nil;
}
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
CGSize selfSize = [self calculateSizeWithText:string limitWidth:limitWith font:font lineSpacing:0 lineHeightMultiple:lineHeightMultiple lineBreakMode:lineBreakMode];
CGSize oneLineSize = [self calculateSizeWithText:@"哈哈" limitWidth:MAXFLOAT font:font lineSpacing:0 lineHeightMultiple:lineHeightMultiple lineBreakMode:lineBreakMode];paragraphStyle.lineSpacing = selfSize.height > oneLineSize.height ? lineSpacing : 0; paragraphStyle.lineHeightMultiple = lineHeightMultiple; paragraphStyle.lineBreakMode = lineBreakMode; return attributedString; }
注：增加一个单行不设置行间距的计算行高方法
/**
-
计算文本高度
-
@param text 文本
-
@param limitW 文本宽度
-
@param font 字体
-
@param lineSpacing 行高
-
@param lineHeightMultiple 行间距
-
@param lineBreakMode 段落样式
-
@return
*/
+ (CGSize)calculateSizeWithText:(NSString *)text limitWidth:(CGFloat)limitW font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode{CGSize selfSize = [self calculateSizeWithText:text limitWidth:limitW font:font lineSpacing:0 lineHeightMultiple:lineHeightMultiple lineBreakMode:lineBreakMode paragraphSpacing:0]; CGSize oneLineSize = [self calculateSizeWithText:@"哈哈" limitWidth:MAXFLOAT font:font lineSpacing:0 lineHeightMultiple:lineHeightMultiple lineBreakMode:lineBreakMode paragraphSpacing:0]; NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; paragraphStyle.lineSpacing = selfSize.height > oneLineSize.height ? lineSpacing : 0; paragraphStyle.lineHeightMultiple = lineHeightMultiple; paragraphStyle.lineBreakMode = lineBreakMode; NSDictionary *cyZoneDocAttribute = @{NSFontAttributeName:font,NSParagraphStyleAttributeName: paragraphStyle}; CGSize size; size = [text boundingRectWithSize:CGSizeMake(limitW, MAXFLOAT) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:cyZoneDocAttribute context:nil].size; return size; }
注：这里增加一个设置富文本属性的时候增加段间距参数
/**
-
富文本
-
@param string 文本
-
@param font 字体
-
@param lineSpacing 行高
-
@param lineHeightMultiple 行间距（1.5倍）
-
@param lineBreakMode 段落样式
-
@param paragraphSpacing 段间距（1.5倍）
-
@return
*/
+ (NSMutableAttributedString *)getAttributedStringWithString:(NSString *)string font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode paragraphSpacing:(CGFloat)paragraphSpacing{
if (string == nil) {
return nil;
}
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing = lineSpacing;
paragraphStyle.lineHeightMultiple = lineHeightMultiple;
paragraphStyle.lineBreakMode = lineBreakMode;
paragraphStyle.paragraphSpacing = paragraphSpacing;NSDictionary *cyZoneDocAttribute = @{NSFontAttributeName:font,NSParagraphStyleAttributeName: paragraphStyle}; [attributedString addAttributes:cyZoneDocAttribute range:NSMakeRange(0, [string length])]; return attributedString; }
注：这里添加增加一个有段间距的方法计算行高
/**
-
计算文本高度
-
@param text 文本
-
@param limitW 文本宽度
-
@param font 字体
-
@param lineSpacing 行高
-
@param lineHeightMultiple 行间距
-
@param lineBreakMode 段落样式
-
@param paragraphSpacing 段间距（1.5倍）
-
@return
*/
+ (CGSize)calculateSizeWithText:(NSString *)text limitWidth:(CGFloat)limitW font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode paragraphSpacing:(CGFloat)paragraphSpacing{NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; paragraphStyle.lineSpacing = lineSpacing; paragraphStyle.lineHeightMultiple = lineHeightMultiple; paragraphStyle.lineBreakMode = lineBreakMode; paragraphStyle.paragraphSpacing = paragraphSpacing; NSDictionary *cyZoneDocAttribute = @{NSFontAttributeName:font,NSParagraphStyleAttributeName: paragraphStyle}; CGSize size; size = [text boundingRectWithSize:CGSizeMake(limitW, MAXFLOAT) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:cyZoneDocAttribute context:nil].size; return size; }
