给UIlabel创建分类 UILabel+LabelHeight.h
1.在.h中写接口,传给它必要的参数
/**
一行代码设置label的高度自适应 和 行间距
@param frame label的frame (高度传入 0 或者其他)
@param contentStr 文本内容
@param font 字体
@param lineSpace 行间距
@param textlengthSpace 字间距
@param paragraphSpacing 段间距
@return 返回UILabel
*/
+(UILabel *)getLineSpaceLabelWithFrame:(CGRect )frame contentString:(NSString*)contentStr withFont:(UIFont*)font withLineSpace:(CGFloat)lineSpace textlengthSpace:(NSNumber* )textlengthSpace paragraphSpacing:(CGFloat)paragraphSpacing;
2.在.m中实现方法
+(UILabel *)getLineSpaceLabelWithFrame:(CGRect)frame contentString:(NSString *)contentStr withFont:(UIFont *)font withLineSpace:(CGFloat)lineSpace textlengthSpace:(NSNumber *)textlengthSpace paragraphSpacing:(CGFloat)paragraphSpacing
{
UILabel *lab = [[UILabel alloc] init];
lab.font = font;
lab.textAlignment = NSTextAlignmentLeft;
lab.numberOfLines = 0;
NSDictionary *attributeDict = [self setTextLineSpaceWithString:contentStr withFont:font withLineSpace:lineSpace withTextlengthSpace:textlengthSpace paragraphSpacing:paragraphSpacing];
CGSize size = [contentStr boundingRectWithSize:frame.size options:NSStringDrawingUsesLineFragmentOrigin attributes:attributeDict context:nil].size;
CGFloat sizeHeight = size.height;
lab.frame = CGRectMake(frame.origin.x,frame.origin.y, frame.size.width, sizeHeight);
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:contentStr attributes:attributeDict];
lab.attributedText = attributedString;
return lab;
}
/*
*给UILabel设置行间距和字间距
*/
+(NSDictionary *)setTextLineSpaceWithString:(NSString*)str withFont:(UIFont*)font withLineSpace:(CGFloat)lineSpace withTextlengthSpace:(NSNumber *)textlengthSpace paragraphSpacing:(CGFloat)paragraphSpacing{
NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];
paraStyle.lineBreakMode = NSLineBreakByCharWrapping;
paraStyle.alignment = NSTextAlignmentLeft;
paraStyle.lineSpacing = lineSpace;
paraStyle.hyphenationFactor = 1.0;
paraStyle.firstLineHeadIndent = 0.0;
paraStyle.paragraphSpacingBefore = 0.0;
paraStyle.headIndent = 0;
paraStyle.tailIndent = 0;
NSDictionary *dic = @{NSFontAttributeName:font,
NSParagraphStyleAttributeName:paraStyle,
NSKernAttributeName:textlengthSpace
};
return dic;
}
3.在viewController里面调用分类中的方法
先把 UILabel+LabelHeight.h 头文件导入
NSString * conText = @"处女座的人，一般都对学识渊博的人，怀着崇敬和想亲近的心。他认为知识是很重要的，丰富的知识可以使人通达于天地之间，不会被命运中不可解的谜所困扰不前。当命运之谜棋阻在他面前时，会激起他更强烈的购物欲，并使他兴致勃勃地从各种角度去诠释它。因此，处女座的人很懂得如何去安慰一个失意的朋友。一般都对学识渊博的人，怀着崇敬和想亲近的心。他认为知识是很重要的，丰富的知识可以使人通达于天地之间，不会被命运中不可解的谜所困扰不前。当命运之谜棋阻在他面前时，会激起他更强烈的购物欲，并使他兴致勃勃地从各种角度去诠释它。因此，处女座的人很懂得如何去安慰一个失意的朋友";
UIFont * font = [UIFont systemFontOfSize:14]; //字号
CGFloat lineSpace = 8;//行间距
CGFloat paragraphSpacing = 0;//段间距
NSNumber * textLengthSpace = @0.5;//字间距
UILabel *label = [UILabel getLineSpaceLabelWithFrame:CGRectMake(20, 150, self.view.bounds.size.width - 40, 0) contentString:conText withFont:font withLineSpace:lineSpace textlengthSpace:textLengthSpace paragraphSpacing:paragraphSpacing];
label.backgroundColor = [UIColor yellowColor];
label.textColor = [UIColor redColor];
[self.view addSubview:label];
实现效果如下:
Demo:GitHub地址