制作具有最大宽度的可变尺寸UILabel

Question

我使用以下代码制作了可变尺寸UILabel 但我想将最大宽度设置为label 你有什么想法吗？

- (void)viewDidLoad {
    CGSize size = [self labelFrameWithString:@"test text"];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, size.width. size.height];
    label.text = @"test text";
}

- (CGSize)labelFrameWithString:(NSString *)string {
    CGRect frame = [string boundingRectWithSize:CGSizeZero
                                        options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingTruncatesLastVisibleLine)
                                     attributes:[NSDictionary dictionaryWithObject:[UIFont systemFontOfSize:16] forKey:NSFontAttributeName]
                                        context:nil];

    return frame.size;
}

Answer 1

您是否尝试传递受约束的CGSize而不是CGSizeZero？

CGSize constraint = CGSizeMake(your_max_width ,NSUIntegerMax);
CGRect frame = [string boundingRectWithSize:constraint
                                    options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingTruncatesLastVisibleLine)
                                 attributes:[NSDictionary dictionaryWithObject:[UIFont systemFontOfSize:16] forKey:NSFontAttributeName]
                                    context:nil];