本文轉載至 http://blog.csdn.net/liulichao20/article/details/8957752
//UILabel自動換行，自適應高度
UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero];
[label setBackgroundColor:[UIColor clearColor]];
[label setFont:[UIFont systemFontOfSize:14]];
[label setLineBreakMode:UILineBreakModeWordWrap];
[label setNumberOfLines:0];
[self.view addSubview:label];
NSString *str = @" fsdfadsfdsfsdfads fdsfads水電費 水電費水電費水電費水電費水電費水電費水電費水電費水電費 水電費水電費水電費 水電費時代fsdf ";
CGSize size = [str sizeWithFont:[UIFont systemFontOfSize:14]constrainedToSize:CGSizeMake(320,500) lineBreakMode:UILineBreakModeWordWrap];
[label setText:str];
[label setFrame:CGRectMake(0.0f, 20.0f, 300, size.height)];
[label release];
//UITextView自動換行，自適應高度
UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(0, 150, 320,240)];
textView.backgroundColor = [UIColor clearColor];
textView.text = str;
textView.scrollEnabled = YES;
textView.font = [UIFont systemFontOfSize:14];
textView.userInteractionEnabled = NO;
textView.autoresizingMask = UIViewAutoresizingFlexibleHeight;
[self.view addSubview:textView];
本文轉載至 http://tangchuanyao.com/20120507760/
自動調整UITextView/UILabel的高度height
很多時候都需要依據用戶輸入的內容自動調整UILabel/UITextView的高度和寬度，特別是UINavigationController的標題，超過一行的時候默認就是「…」我們希望他能換行表示，這樣就需要根據內容調整titleView的高度啦。直接貼sample代碼，高度和寬度可以根據自己的需要調整。
UILabel Sample code
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CGRect frame = CGRectMake(20, 0, 280,44);
CGSize labelsize = [titleLabel.text sizeWithFont:[UIFont boldSystemFontOfSize: 16.0f]
constrainedToSize:CGSizeMake(320, 44)
lineBreakMode:UILineBreakModeTailTruncation];
frame.size.width = labelsize.width;
frame.size.height = labelsize.height;
titleLabel.frame = frame;
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UITextView Sample code
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CGRect frame = noteTextView.frame;
CGSize size = [noteTextView.text sizeWithFont:noteTextView.font
constrainedToSize:CGSizeMake(280, 1000)
lineBreakMode:UILineBreakModeTailTruncation];
frame.size.height = size.height > 1 ? size.height + 20 : 64;
noteTextView.frame = frame;
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UITextView是UIScrollView的子類，因此有contentSize屬性，也可以按如下實現
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CGRect frame = noteTextView.frame;
frame.size.height = noteTextView.contentSize.height;
noteTextView.frame = frame;
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本文轉載至 http://blog.sina.com.cn/s/blog_759d3e120101alji.html
蘋果API
UILineBreakMode
Options for wrapping and truncating text. (Deprecated. Use NSLineBreakMode instead.)
typedef enum {
UILineBreakModeWordWrap = 0,
UILineBreakModeCharacterWrap,
UILineBreakModeClip,
UILineBreakModeHeadTruncation,
UILineBreakModeTailTruncation,
UILineBreakModeMiddleTruncation,
} UILineBreakMode;
NSLineBreakMode
These constants specify what happens when a line is too long for its container.
enum {
NSLineBreakByWordWrapping = 0,
NSLineBreakByCharWrapping,
NSLineBreakByClipping,
NSLineBreakByTruncatingHead,
NSLineBreakByTruncatingTail,
NSLineBreakByTruncatingMiddle
};
typedef NSUInteger NSLineBreakMode
lineBreak模式在6.0之前一直用UILineBreakMode枚舉類型，6.0使用NSLineBreakMode枚舉類型。枚舉值中各個值的意義，解釋如下：
UILineBreakModeWordWrap = 0,
以單詞為單位換行，以單位為單位截斷。
UILineBreakModeCharacterWrap,
以字符為單位換行，以字符為單位截斷。
UILineBreakModeClip,
以單詞為單位換行。以字符為單位截斷。
UILineBreakModeHeadTruncation,
以單詞為單位換行。如果是單行，則開始部分有省略號。如果是多行，則中間有省略號，省略號后面有4個字符。
UILineBreakModeTailTruncation,
以單詞為單位換行。無論是單行還是多行，都是末尾有省略號。
UILineBreakModeMiddleTruncation,
以單詞為單位換行。無論是單行還是多行，都是中間有省略號，省略號后面只有2個字符。