如何在Swift中按图像大小调整UIImageView的大小

Question

我想使用缩放增加图像。我做了这个，并且这相当于图像类型大小的大小，但我仍然像这样的变化顶部背景？我该怎么做？

我在viewDidLoad中的imageView

import initialState from '../store/initialState';
import * as ActionTypes from '../actionTypes/authActionTypes';

const authReducer = function authReducer(state = initialState.auth, action) {
  switch (action.type) {
    case ActionTypes.LOGIN_REQUEST:
      return Object.assign({}, state, {
        isLoggingIn: true,
        isLoggedIn: false,
      });
    case ActionTypes.LOGOUT:
      return Object.assign({}, state, {
        isLoggedIn: false,
        isLoggingIn: false,
      });
    case ActionTypes.LOGIN_FAILURE:
      return Object.assign({}, state, {
        error: action.error,
        isLoggingIn: false,
        isLoggedIn: false,
      });
    case ActionTypes.LOGIN_SUCCESS:
      return Object.assign({}, state, {
        isLoggedIn: true,
        isLoggingIn: false,
        response: action.response,
      });
    default:
      return state;
  }
};

export default authReducer;

Answer 1

我是这样做的

    override func viewDidLoad() {
    super.viewDidLoad()

    let image = UIImage(contentsOfFile: document.documentImageURL)
    imageView = UIImageView(image: image)
    imageView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]

    scrollView = UIScrollView(frame: view.bounds)
    scrollView.delegate = self
    scrollView.backgroundColor = UIColor(red: 129/255.0, green: 130/255.0, blue: 130/255.0, alpha: 1.0)
    scrollView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
    scrollView.showsHorizontalScrollIndicator = false
    scrollView.showsVerticalScrollIndicator = false
    scrollView.addSubview(imageView)
    view.addSubview(scrollView)
    newZoomScale()
    scrollView.setZoomScale(scrollView.minimumZoomScale, animated: false)
    setGesture()
    setNavigationBar()
}

private func newZoomScale() {
    let imageViewSize = imageView.bounds.size
    let scrollViewSize = scrollView.bounds.size
    let widthScale = scrollViewSize.width / imageViewSize.width
    let heightScale = scrollViewSize.height / imageViewSize.height
    scrollView.minimumZoomScale = min(widthScale, heightScale)
    scrollView.zoomScale = 1.0
}

func scrollViewDidZoom(scrollView: UIScrollView) {
        let imageViewSize = imageView.frame.size
        let scrollViewSize = scrollView.bounds.size

        let verticalPadding = imageViewSize.height < scrollViewSize.height ? (scrollViewSize.height - imageViewSize.height) / 2 : 0
        let horizontalPadding = imageViewSize.width < scrollViewSize.width ? (scrollViewSize.width - imageViewSize.width) / 2 : 0

        self.scrollView.contentInset = UIEdgeInsets(top: verticalPadding, left: horizontalPadding, bottom: verticalPadding, right: horizontalPadding)
    }