ios - UITextView 文本空间在调整大小时变小

Question

我想让用户调整 UITextView 的大小。我在 UITextView 的右下角显示一个按钮，例如当用户移动它时，UITextView 会跟随它并调整大小。

这工作正常，但文本空间有一个奇怪的行为。在调整大小时，文本空间似乎变得越来越小。所以如果我调整很多，转到一个大框架，然后转到一个小框架，文本空间就会变得比框架小。

- (id) init{//My subclass of UITextView
    self = [super init];
    if(self){
        //Resize button
        //Init ResizeButton
        self.resizeButton = [[UIButton alloc]init];

        //Image
        [self.resizeButton setImageForAllState:[UIImage imageNamed:@"Isosceles-right-triangle.png"]];

        //Target
        [self.resizeButton addTarget:self action:@selector(wasDragged:withEvent:) forControlEvents:UIControlEventTouchDragInside];
        [self.resizeButton addTarget:self action:@selector(wasDragged:withEvent:) forControlEvents:UIControlEventTouchDragOutside];

        //Add to view
        [self addSubview:resizeButton];

        //Self
        //text font
        [self setFont:[UIFont fontWithName:@"papyrus" size:17]];

    }
    return self;
}

- (void)wasDragged:(UIButton *)button withEvent:(UIEvent *)event
{


//  NSLog(@"wasDragged");// get the touch
    UITouch *touch = [[event touchesForView:button] anyObject];

    // get delta
    CGPoint previousLocation = [touch previousLocationInView:button];
    CGPoint location = [touch locationInView:button];
    CGFloat delta_x = location.x - previousLocation.x;
    CGFloat delta_y = location.y - previousLocation.y;

    // move button
    button.center = CGPointMake(button.center.x + delta_x,
                                button.center.y + delta_y);


    self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width+ delta_x, self.frame.size.height+ delta_y);

}

View 也是可拖动的

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    // Calculate offset
    CGPoint pt = [[touches anyObject] locationInView:self];
    float dx = pt.x - startLocation.x;
    float dy = pt.y - startLocation.y;
    CGPoint newcenter = CGPointMake(self.center.x + dx, self.center.y + dy);

    // Set new location
    self.center = newcenter;

}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    // Calculate and store offset, and pop view into front if needed
    CGPoint pt = [[touches anyObject] locationInView:self];
    startLocation = pt;
}

-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {


}

---

编辑

调整大小之前

调整大小

回到原来的大小

Answer 1

我也有这个问题。解决方案是子类化 UITextView 并覆盖 setFrame: 方法。在设置你想要的框架之前，为 textView 设置 CGRectZero 框架。它会解决你的问题。代码如下。

- (void)setFrame:(CGRect)frame
{
    [super setFrame:CGRectZero];
    [super setFrame:frame];
}