IOS Development----Cgaffinetransform pan, rotate, zoom

Be sure to remember the three steps when doing panning, rotating, and zooming:

1. Gets the value (Gets the Transform property value of the current control)

2. Modify the value (modify the value of the transform property that needs to be set)

3. Assignment (assigns the value of the modified transform property to the original value)

/** * Pan * * @param transform get the current deformation transform * @param tx pan along the x horizontal direction * @param ty pans along the y vertical direction * * @return Returns the results after the move */cgaffinetransformtranslate (Cgaffinetransform T, cgfloat tx, cgfloat ty)

/** * Zoom * * @param transform get current deformation transform * @param sx Horizontal Scaling * @param sy Vertical Scale * * @ret Urn Scaling result */Cgaffinetransformscale (Cgaffinetransform T, cgfloat SX, CGFloat Sy)

/** * Rotate * * @param transform get the current deformation transform * @param angle Rotation angle * * @return return the rotated results */CGAFFINETRANSFORMR Otate (Cgaffinetransform t, cgfloat angle)

/** * Restore * */cgaffinetransformidentity

With the above settings you can translate, rotate, and zoom the effect of a control

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IOS Development----Cgaffinetransform pan, rotate, zoom