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在ios开发中经常会用到uilabel来展示一些文字性的内容，但是默认的文字排版会觉得有些挤，为了更美观也更易于阅读我们可以通过某些方法将uilabel的行间距和字间距按照需要调节。
比如一个label的默认间距效果是这样：
然后用一个封装起来的category来调整这部分文字的行间距，其中5.0就是我自定义的文字间距：
[uilabel changelinespaceforlabel:cell.describelabel withspace:5.0];
调整后的效果是这样的：
这是一个uilabel 的category，他的内部实现是这样的：
uilabel+changelinespaceandwordspace.h
#import <uikit/uikit.h> @interface uilabel (changelinespaceandwordspace) /** * 改变行间距 */ + (void)changelinespaceforlabel:(uilabel *)label withspace:(float)space; /** * 改变字间距 */ + (void)changewordspaceforlabel:(uilabel *)label withspace:(float)space; /** * 改变行间距和字间距 */ + (void)changespaceforlabel:(uilabel *)label withlinespace:(float)linespace wordspace:(float)wordspace; @end
uilabel+changelinespaceandwordspace.m
我要评论#import "uilabel+changelinespaceandwordspace.h"
@implementation uilabel (changelinespaceandwordspace)
+ (void)changelinespaceforlabel:(uilabel *)label withspace:(float)space {
nsstring *labeltext = label.text;
nsmutableattributedstring *attributedstring = [[nsmutableattributedstring alloc] initwithstring:labeltext];
nsmutableparagraphstyle *paragraphstyle = [[nsmutableparagraphstyle alloc] init];
[paragraphstyle setlinespacing:space];
[attributedstring addattribute:nsparagraphstyleattributename value:paragraphstyle range:nsmakerange(0, [labeltext length])];
label.attributedtext = attributedstring;
[label sizetofit];
}
+ (void)changewordspaceforlabel:(uilabel *)label withspace:(float)space {
nsstring *labeltext = label.text;
nsmutableattributedstring *attributedstring = [[nsmutableattributedstring alloc] initwithstring:labeltext attributes:@{nskernattributename:@(space)}];
nsmutableparagraphstyle *paragraphstyle = [[nsmutableparagraphstyle alloc] init];
[attributedstring addattribute:nsparagraphstyleattributename value:paragraphstyle range:nsmakerange(0, [labeltext length])];
label.attributedtext = attributedstring;
[label sizetofit];
}
+ (void)changespaceforlabel:(uilabel *)label withlinespace:(float)linespace wordspace:(float)wordspace {
nsstring *labeltext = label.text;
nsmutableattributedstring *attributedstring = [[nsmutableattributedstring alloc] initwithstring:labeltext attributes:@{nskernattributename:@(wordspace)}];
nsmutableparagraphstyle *paragraphstyle = [[nsmutableparagraphstyle alloc] init];
[paragraphstyle setlinespacing:linespace];
[attributedstring addattribute:nsparagraphstyleattributename value:paragraphstyle range:nsmakerange(0, [labeltext length])];
label.attributedtext = attributedstring;
[label sizetofit];
}
@end
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