iOS7: UILabel 内容高度自适应

在 iOS7 中,如何根据 UILabel 的文字内容,自动调整其高度?

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TestDemo.zip 预估大小:82个文件
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TestDemo 文件夹
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.DS_Store 6KB
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TestDemo.xcodeproj 文件夹
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project.xcworkspace 文件夹
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contents.xcworkspacedata 153B
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xcuserdata 文件夹
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fe.xcuserdatad 文件夹
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UserInterfaceState.xcuserstate 23KB
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xcuserdata 文件夹
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fe.xcuserdatad 文件夹
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xcdebugger 文件夹
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Breakpoints_v2.xcbkptlist 766B
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xcschemes 文件夹
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xcschememanagement.plist 570B
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TestDemo.xcscheme 3KB
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project.pbxproj 21KB
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TestDemoTests 文件夹
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en.lproj 文件夹
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InfoPlist.strings 45B
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TestDemoTests-Info.plist 685B
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TestDemoTests.m 629B
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UILabel+ContentSize.m 835B
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.git 文件夹
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logs 文件夹
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HEAD 163B
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refs 文件夹
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heads 文件夹
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config 137B
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refs 文件夹
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heads 文件夹
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master 41B
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tags 文件夹
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branches 文件夹
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hooks 文件夹
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pre-applypatch.sample 398B
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pre-push.sample 1KB
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commit-msg.sample 896B
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pre-commit.sample 2KB
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applypatch-msg.sample 452B
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prepare-commit-msg.sample 1KB
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update.sample 4KB
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post-update.sample 189B
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pre-rebase.sample 5KB
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description 73B
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girl.png 91KB
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TestDemo 文件夹
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ViewController.xib 1KB
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ViewController.m 4KB
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en.lproj 文件夹
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InfoPlist.strings 45B
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main.m 327B
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TestDemo-Info.plist 1KB
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TestDemo-Prefix.pch 344B
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Images.xcassets 文件夹
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LaunchImage.launchimage 文件夹
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Contents.json 442B
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AppIcon.appiconset 文件夹
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Contents.json 333B
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ViewController.h 205B
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AppDelegate.h 350B
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AppDelegate.m 2KB
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UILabel+ContentSize.h 90B
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zip 文件大小:261.43KB