Я написал собственный усеченный класс, который вы можете использовать в своем коде где угодно.Просто используйте этот метод ниже.он вернет true, если усечение имело место, и MaxWidth можно оставить равным 0, если вы просто хотите использовать ширину кадра меток по умолчанию.Поместите maxWidth как нечто меньшее, чем ширина фрейма, чтобы сократить его в пределах его фрейма.
Swift 2 (с некоторыми быстрыми 3 комментариями для преобразования)
использование:
Truncater.replaceElipsis(forLabel: label, withString: "???")
let didTruncate = Truncater.replaceElipsis(forLabel: label, withString: "1234", andMaximumWidth: 50) //maxWidth is not number of chars, but label width in CGFloat
класс:
import UIKit
class Truncater {
class func replaceElipsis(forLabel label:UILabel, withString replacement:String) -> Bool {
return replaceElipsis(forLabel: label, withString: replacement, andMaximumWidth:0)
}
class func replaceElipsis(forLabel label:UILabel, withString replacement:String, andMaximumWidth width:CGFloat) -> Bool {
if(label.text == nil){
return false
}
let origSize = label.frame;
var useWidth = width
if(width <= 0){
useWidth = origSize.width //use label width by default if width <= 0
}
label.sizeToFit()
let labelSize = label.text!.sizeWithAttributes([NSFontAttributeName: label.font]) //.size(attributes: [NSFontAttributeName: label.font]) for swift 3
if(labelSize.width > useWidth){
let original = label.text!;
let truncateWidth = useWidth;
let font = label.font;
let subLength = label.text!.characters.count
var temp = label.text!.substringToIndex(label.text!.endIndex.advancedBy(-1)) //label.text!.substring(to: label.text!.index(label.text!.endIndex, offsetBy: -1)) for swift 3
temp = temp.substringToIndex(temp.startIndex.advancedBy(getTruncatedStringPoint(subLength, original:original, truncatedWidth:truncateWidth, font:font, length:subLength)))
temp = String.localizedStringWithFormat("%@%@", temp, replacement)
var count = 0
while temp.sizeWithAttributes([NSFontAttributeName: label.font]).width > useWidth {
count+=1
temp = label.text!.substringToIndex(label.text!.endIndex.advancedBy(-(1+count)))
temp = temp.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet()) //remove this if you want to keep whitespace on the end
temp = String.localizedStringWithFormat("%@%@", temp, replacement)
}
label.text = temp;
label.frame = origSize;
return true;
}
else {
label.frame = origSize;
return false
}
}
class func getTruncatedStringPoint(splitPoint:Int, original:String, truncatedWidth:CGFloat, font:UIFont, length:Int) -> Int {
let splitLeft = original.substringToIndex(original.startIndex.advancedBy(splitPoint))
let subLength = length/2
if(subLength <= 0){
return splitPoint
}
let width = splitLeft.sizeWithAttributes([NSFontAttributeName: font]).width
if(width > truncatedWidth) {
return getTruncatedStringPoint(splitPoint - subLength, original: original, truncatedWidth: truncatedWidth, font: font, length: subLength)
}
else if (width < truncatedWidth) {
return getTruncatedStringPoint(splitPoint + subLength, original: original, truncatedWidth: truncatedWidth, font: font, length: subLength)
}
else {
return splitPoint
}
}
}
Объектив C
+ (bool) replaceElipsesForLabel:(UILabel*) label With:(NSString*) replacement MaxWidth:(float) width
класс:
//=============================================Header=====================================================
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface CustomTruncater : NSObject
+ (bool) replaceElipsesForLabel:(UILabel*) label With:(NSString*) replacement MaxWidth:(float) width;
@end
//========================================================================================================
#import "CustomTruncater.h"
@implementation CustomTruncater
static NSString *original;
static float truncateWidth;
static UIFont *font;
static int subLength;
+ (bool) replaceElipsesForLabel:(UILabel*) label With:(NSString*) replacement MaxWidth:(float) width {
CGRect origSize = label.frame;
float useWidth = width;
if(width <= 0)
useWidth = origSize.size.width; //use label width by default if width <= 0
[label sizeToFit];
CGSize labelSize = [label.text sizeWithFont:label.font];
if(labelSize.width > useWidth) {
original = label.text;
truncateWidth = useWidth;
font = label.font;
subLength = label.text.length;
NSString *temp = [label.text substringToIndex:label.text.length-1];
temp = [temp substringToIndex:[self getTruncatedStringPoint:subLength]];
temp = [NSString stringWithFormat:@"%@%@", temp, replacement];
int count = 0;
while([temp sizeWithFont:label.font].width > useWidth){
count++;
temp = [label.text substringToIndex:(label.text.length-(1+count))];
temp = [temp stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]; //remove this if you want to keep whitespace on the end
temp = [NSString stringWithFormat:@"%@%@", temp, replacement];
}
label.text = temp;
label.frame = origSize;
return true;
}
else {
label.frame = origSize;
return false;
}
}
+ (int) getTruncatedStringPoint:(int) splitPoint {
NSString *splitLeft = [original substringToIndex:splitPoint];
subLength /= 2;
if(subLength <= 0)
return splitPoint;
if([splitLeft sizeWithFont:font].width > truncateWidth){
return [self getTruncatedStringPoint:(splitPoint - subLength)];
}
else if ([splitLeft sizeWithFont:font].width < truncateWidth) {
return [self getTruncatedStringPoint:(splitPoint + subLength)];
}
else {
return splitPoint;
}
}
@end