UILabel适合问题

Question

我使用此方法重新计算标签的框架：

- (void)fitElements {    
    CGFloat currentX = 0.0;
    CGFloat currentY = 0.0;    
    for (UIView *view in elements) {    
        CGRect rect = view.frame;
        rect.origin.x = currentX;
        rect.origin.y = currentY;        
        currentX = rect.origin.x + rect.size.width + 5;        
        view.frame = rect;      
        if (currentX >= 420) {
            currentX = 0.0;
            currentY += rect.size.height + 5;
        }
    }
}

如果我的标签越过边界超过420我将我的对象移动到下一行。

- (void)createElements {
    NSInteger tag = 0;
    for (NSString *str in words) {
        UILabel *label = [[UILabel alloc] init];
        [self addGesture:label];
        [label setTextColor:[UIColor blueColor]];
        label.text = str;
        [label setAlpha:0.8];
        [label sizeToFit];
        [elements addObject:label];
    }
}

如果我按上面创建对象（使用[label sizeToFit];）

，这就是它的样子

因为我们可以看到我的所有标签都超出了边界

但如果我使用硬编码框架的标签，我会得到这个：

这就是我想要的，但在这种情况下，我有对象的静态宽度。

这是我使用硬编码帧的方法。

- (void)createElements {
    NSInteger tag = 0;
    for (NSString *str in words) {
        UILabel *label = [[UILabel alloc] init];
        [self addGesture:label];
        [label setTextColor:[UIColor blueColor]];
        label.text = str;
        [label setAlpha:0.8];
        [label setFrame:CGRectMake(0, 0, 100, 20)];
        [elements addObject:label];
        tag++;
    }
}

如何制作具有相对宽度的对象，并且还可以正确重新计算？

Answer 1

你可以通过对代码的小修改来实现类似左对齐的东西：

- (void)fitElements {
CGFloat currentX = 0.0;
CGFloat currentY = 0.0;
for (UILabel *view in elements) { //UIView changed to UILabel
    CGRect rect = view.frame;
    rect.origin.x = currentX;
    rect.origin.y = currentY;
    rect.size.width = [self widthOfString: view.text withFont:view.font];
    currentX = rect.origin.x + rect.size.width + 5;
    view.frame = rect;
    if (currentX + rect.size.width >= 420) {   //EDIT done here
        currentX = 0.0;
        currentY += rect.size.height + 5;
        rect.origin.x = currentX;
        rect.origin.y = currentY;
        view.frame = rect;
        currentX = rect.origin.x + rect.size.width + 5;
    }
}}

- (CGFloat)widthOfString:(NSString *)string withFont:(NSFont *)font {
     NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:font, NSFontAttributeName, nil];
     return [[[NSAttributedString alloc] initWithString:string attributes:attributes] size].width;
 }

widthOfString方法是从Stephen's answer

复制的

修改

您还可以在NSString UIKit Additions中找到许多处理字符串图形表示大小的有用方法。