iOS上是否可以有从右到左的进度条？ [英] Is a Right-to-Left progress bar possible on iOS?

问题描述

我已尝试发送 [UIProgressView setProgress] 负值，但无效。

解决方案

您可以尝试设置< a href =http://developer.apple.com/library/ios/#documentation/uikit/reference/UIView_Class/UIView/UIView.html#//apple_ref/occ/instp/UIView/transform> <$ c $将 UIProgressView 的c> transform 属性转换为旋转的新 CGAffineTransform 视图180度并垂直翻转（保留shininess）（参见 CGAffineTransformMake（）和 CGAffineTransformRotate（）

  UIProgressView * pv = [[UIProgressView alloc] initWithProgressViewStyle：UIProgressViewStyleBar]; 
 pv.frame = CGRectMake（10，100，300，11）; 
 CGAffineTransform transform = CGAffineTransformMake（1，0，0，-1，0，pv.frame.size.height）; //垂直翻转视图
 transform = CGAffineTransformRotate（transform，M_PI）; //旋转角度以弧度表示
 pv.transform = transform; 
 pv.progress = 0.5; 
  




I've tried sending [UIProgressView setProgress] negative values, and that doesn't work.

Is there some other way to get a progress bar that fills from the right-hand end?

解决方案

You could try setting the transform property of your UIProgressView to a new CGAffineTransform that rotates the view by 180 degrees and flips it vertically (to preserve the "shininess") (see CGAffineTransformMake() and CGAffineTransformRotate()).

Something along the lines of:

UIProgressView *pv = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleBar];
pv.frame = CGRectMake(10, 100, 300, 11);
CGAffineTransform transform = CGAffineTransformMake(1, 0, 0, -1, 0, pv.frame.size.height); // Flip view vertically
transform = CGAffineTransformRotate(transform, M_PI); //Rotation angle is in radians
pv.transform = transform;
pv.progress = 0.5;

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