ios 中內容label高度自適應 – iPhone手機開發技術文章 iPhone軟體開發教學課程

首先並且最重要的是計算文本高度,然後再設置label的高度,

計算文本高度:

假設文本:

NSString*strtest =@”
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事實上ios 有兩種方法:

ios7.0之前用:

[strtestsizeWithFont:ContentFontconstrainedToSize:CGSizeMake(ScreenWeight
-20, 1000) lineBreakMode:NSLineBreakByWordWrapping];

之後用下面的方法比較好:

CGRect frame = [strtestboundingRectWithSize:CGSizeMake(220,1000)
options:NSStringDrawingUsesLineFragmentOriginattributes:@{NSFontAttributeName:[UIFontsystemFontOfSize:10]}context:nil];

attributes參數有:

NSFontAttributeName // UIFont, default Helvetica(Neue) 12

NSParagraphStyleAttributeName // NSParagraphStyle, default defaultParagraphStyle

NSForegroundColorAttributeName // UIColor, default blackColor

NSBackgroundColorAttributeName // UIColor, default nil: no background

NSLigatureAttributeName // NSNumber containing integer, default 1: default ligatures, 0: no ligatures

NSKernAttributeName // NSNumber containing floating point value, in points; amount to modify default kerning. 0 means kerning is disabled.

NSStrikethroughStyleAttributeName ; // NSNumber containing integer, default 0: no strikethrough

NSUnderlineStyleAttributeName // NSNumber containing integer, default 0: no underline

NSStrokeColorAttributeName // UIColor, default nil: same as foreground color

NSStrokeWidthAttributeName // NSNumber containing floating point value, in percent of font point size, default 0: no stroke; positive for stroke alone, negative for stroke
and fill (a typical value for outlined text would be 3.0)

NSShadowAttributeName ; // NSShadow, default nil: no shadow

NSTextEffectAttributeName // NSString, default nil: no text effect

NSAttachmentAttributeName // NSTextAttachment, default nil

NSLinkAttributeName // NSURL (preferred) or NSString

NSBaselineOffsetAttributeName // NSNumber containing floating point value, in points; offset from baseline, default 0

NSUnderlineColorAttributeName // UIColor, default nil: same as foreground color

NSStrikethroughColorAttributeName // UIColor, default nil: same as foreground color

NSObliquenessAttributeName // NSNumber containing floating point value; skew to be applied to glyphs, default 0: no skew

NSExpansionAttributeName // NSNumber containing floating point value; log of expansion factor to be applied to glyphs, default 0: no expansion

建立label的時候註意:

① label的font,必須和計算時用的font一樣

② label的numberOfLines要設置為零

③ label的寬度設置成計算時設置的寬度一致

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