获取UILabel中第一行的string

我在UILabel有一些文本。 我想获取stringvariables中第一个标签的文本。

例如：

 label.text = @"You make an object by creating an instance of a particular class. You do this by allocating the object and initializing it with acceptable default values. When you allocate an object, you set aside enough memory for the object and set all instance variables to zero. Initialization sets an object's initial state—that is, its instance variables and properties—to reasonable values and then returns the object. The purpose of initialization is to return a usable object. You need to both allocate and initialize an object to be able to use it."; 

现在我想要获取UILabel第一行的文本。

Answer 1

1.添加CoreText.framework。 2.导入#import CoreText / CoreText.h>。 然后使用下面的方法 –

 -(NSArray *)getLinesArrayOfStringInLabel:(UILabel *)label { NSString *text = [label text]; UIFont *font = [label font]; CGRect rect = [label frame]; CTFontRef myFont = CTFontCreateWithName(( CFStringRef)([font fontName]), [font pointSize], NULL); NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:text]; [attStr addAttribute:(NSString *)kCTFontAttributeName value:( id)myFont range:NSMakeRange(0, attStr.length)]; CFRelease(myFont); CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString(( CFAttributedStringRef)attStr); CGMutablePathRef path = CGPathCreateMutable(); CGPathAddRect(path, NULL, CGRectMake(0,0,rect.size.width,100000)); CTFrameRef frame = CTFramesetterCreateFrame(frameSetter, CFRangeMake(0, 0), path, NULL); NSArray *lines = ( NSArray *)CTFrameGetLines(frame); NSMutableArray *linesArray = [[NSMutableArray alloc]init]; for (id line in lines) { CTLineRef lineRef = ( CTLineRef )line; CFRange lineRange = CTLineGetStringRange(lineRef); NSRange range = NSMakeRange(lineRange.location, lineRange.length); NSString *lineString = [text substringWithRange:range]; CFAttributedStringSetAttribute((CFMutableAttributedStringRef)attStr, lineRange, kCTKernAttributeName, (CFTypeRef)([NSNumber numberWithFloat:0.0])); CFAttributedStringSetAttribute((CFMutableAttributedStringRef)attStr, lineRange, kCTKernAttributeName, (CFTypeRef)([NSNumber numberWithInt:0.0])); //NSLog(@"''''''''''''''''''%@",lineString); [linesArray addObject:lineString]; } [attStr release]; CGPathRelease(path); CFRelease( frame ); CFRelease(frameSetter); return (NSArray *)linesArray; } 

我从下面的urlfind了这个答案 – 如何从UILabel的第n行获取文本？

 NSString *firstLineString = [[self getLinesArrayOfStringInLabel:yourLabel] objectAtIndex:0]; 

Answer 2

 NSString *text = label.text; //remove any leading or trailing whitespace or line breaks text = [text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; //find the the range of the first occuring line break, if any. NSRange range = [text rangeOfString:@"\n"]; //if there is a line break, get a substring up to that line break if(range.location != NSNotFound) text = [text substringToIndex:range.location]; 

Answer 3

这可能会帮助你

 var array = string.componentsSeparatedByString("\r") 

这将用新行分隔string，并且您可以获得数组中的行明文。