xcode 在objective-c中从uilabel获取文本
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getting text from uilabel in objective-c
提问by charlie johnston
I have a project where I am trying to grab text from a uilabel that has been populated from a web service. I can grab and manipulate the text just fine but I need to send certain characters from the string to another web service call. I can not figure out how to grab the first, second and last characters in my string. I am both new to Objective-C as well as programming so any help would be much appreciated.
我有一个项目，我试图从 Web 服务填充的 uilabel 中获取文本。我可以很好地抓取和操作文本，但我需要将字符串中的某些字符发送到另一个 Web 服务调用。我不知道如何获取字符串中的第一个、第二个和最后一个字符。我对 Objective-C 和编程都很陌生，所以任何帮助都将不胜感激。
回答by Ondrej Peterka
You can do it like this:
你可以这样做：
UILabel * l = [[UILabel alloc] init];
l.text = @"abcdef"; //set text to uilabel
[self.view addSubview:l];
NSString * text = l.text; //get text from uilabel
unichar first = [text characterAtIndex:0]; //get first char
unichar second = [text characterAtIndex:1];
unichar last = [text characterAtIndex:text.length -1];
If you need results as strings you can use:
如果您需要将结果作为字符串，您可以使用：
NSString * firstAsString = [text substringWithRange:NSMakeRange(0, 1)]; //first character as string
or you can convert the unichar to string like this:
或者您可以像这样将 unichar 转换为字符串：
NSString * x = [NSString stringWithFormat:@"%C", last];
回答by ant
Per this it should be fairly easy:
根据这一点，它应该相当容易：
textLabel.text = @"Foo";
Where textLabelis instance of UILabel
textLabel实例在哪里UILabel
