UIImageView缩放图像问题
我有一个UIImage，其宽度远大于它的高度。我试图在保持纵横比的同时在UIImageView中显示它，但是imageview只显示图像的一小部分。我做错了吗？
func scale(image:UIImage) {
imageView.contentMode = UIViewContentMode.ScaleAspectFit
imageView.image = image
print(imageView.frame.size.width)
print(image.size.width)
}
在控制台中打印出来：
250.0
3024.0
，image.size.height的值为150。
我希望它看起来像这样
但它看起来像这样
1 个答案:
答案 0 :(得分：0)
我无法理解你的问题。你能展示更多代码和故事板吗？
无论如何，这里是研究这个问题的例子：
ViewController.swift
import UIKit
class ViewController: UIViewController {
@IBOutlet var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func SelectImage(sender: UIButton) {
switch sender.tag {
case 0:
imageView.image = UIImage(named: "image1")
case 1:
imageView.image = UIImage(named: "image2")
default:
break
}
}
}
Main.storyboard
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15G31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="mG9-Ie-ulu">
<dependencies>
<deployment identifier="iOS"/>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
<capability name="Constraints to layout margins" minToolsVersion="6.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="phU-zf-Z59">
<objects>
<viewController id="e22-se-1BX" customClass="ViewController" customModule="stackoverflow_39322193" customModuleProvider="target" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="ieU-T4-sfY"/>
<viewControllerLayoutGuide type="bottom" id="pBS-7o-IXo"/>
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="GUS-lS-q7w">
<rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="image1" translatesAutoresizingMaskIntoConstraints="NO" id="upT-By-1gT">
<rect key="frame" x="0.0" y="20" width="600" height="536"/>
</imageView>
<button opaque="NO" tag="1" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="j8O-MB-VWm">
<rect key="frame" x="479" y="562" width="102" height="30"/>
<state key="normal" title="Select Image 2"/>
<connections>
<action selector="SelectImage:" destination="e22-se-1BX" eventType="touchUpInside" id="uLd-Po-8ev"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="agx-9V-LpP">
<rect key="frame" x="20" y="562" width="100" height="30"/>
<state key="normal" title="Select Image 1"/>
<connections>
<action selector="SelectImage:" destination="e22-se-1BX" eventType="touchUpInside" id="o9C-8u-JxX"/>
</connections>
</button>
</subviews>
<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
<constraints>
<constraint firstItem="agx-9V-LpP" firstAttribute="leading" secondItem="GUS-lS-q7w" secondAttribute="leadingMargin" id="Gx9-Lx-S7I"/>
<constraint firstAttribute="trailing" secondItem="upT-By-1gT" secondAttribute="trailing" id="Hji-6d-ORN"/>
<constraint firstAttribute="trailingMargin" secondItem="j8O-MB-VWm" secondAttribute="trailing" constant="-1" id="Jst-1T-PP4"/>
<constraint firstItem="agx-9V-LpP" firstAttribute="top" secondItem="upT-By-1gT" secondAttribute="bottom" constant="6" id="STt-vV-su8"/>
<constraint firstItem="agx-9V-LpP" firstAttribute="top" secondItem="j8O-MB-VWm" secondAttribute="top" id="Uhl-PA-XLU"/>
<constraint firstItem="upT-By-1gT" firstAttribute="leading" secondItem="GUS-lS-q7w" secondAttribute="leading" id="Xay-ar-ZB2"/>
<constraint firstItem="upT-By-1gT" firstAttribute="top" secondItem="GUS-lS-q7w" secondAttribute="top" constant="20" symbolic="YES" id="ZT9-p7-2vo"/>
<constraint firstItem="pBS-7o-IXo" firstAttribute="top" secondItem="agx-9V-LpP" secondAttribute="bottom" constant="8" symbolic="YES" id="cRT-De-cHc"/>
<constraint firstItem="agx-9V-LpP" firstAttribute="baseline" secondItem="j8O-MB-VWm" secondAttribute="baseline" id="zc4-Dn-9Iu"/>
</constraints>
</view>
<connections>
<outlet property="imageView" destination="upT-By-1gT" id="Z9C-40-UW3"/>
</connections>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="Bqi-Ne-i08" userLabel="First Responder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="1116" y="517"/>
</scene>
<!--Root View Controller-->
<scene sceneID="ywS-Tj-ArZ">
<objects>
<tableViewController id="Ixy-MR-Jzp" sceneMemberID="viewController">
<tableView key="view" clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="static" style="plain" separatorStyle="default" rowHeight="44" sectionHeaderHeight="28" sectionFooterHeight="28" id="qeH-hZ-NWL">
<rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
<sections>
<tableViewSection id="z96-NS-xWx">
<cells>
<tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="default" indentationWidth="10" id="z9h-YZ-NYn">
<rect key="frame" x="0.0" y="64" width="600" height="44"/>
<autoresizingMask key="autoresizingMask"/>
<tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="z9h-YZ-NYn" id="MBf-LU-nOF">
<rect key="frame" x="0.0" y="0.0" width="600" height="43"/>
<autoresizingMask key="autoresizingMask"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="show image" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="taK-E6-9Tb">
<rect key="frame" x="254" y="11" width="92" height="21"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
<nil key="highlightedColor"/>
</label>
</subviews>
<constraints>
<constraint firstItem="taK-E6-9Tb" firstAttribute="centerY" secondItem="MBf-LU-nOF" secondAttribute="centerY" id="Uxk-t1-uBI"/>
<constraint firstItem="taK-E6-9Tb" firstAttribute="centerX" secondItem="MBf-LU-nOF" secondAttribute="centerX" id="fqV-Xt-MGV"/>
</constraints>
</tableViewCellContentView>
<connections>
<segue destination="e22-se-1BX" kind="show" identifier="showImageView" id="fpv-Ij-HJm">
<nil key="action"/>
</segue>
</connections>
</tableViewCell>
</cells>
</tableViewSection>
</sections>
<connections>
<outlet property="dataSource" destination="Ixy-MR-Jzp" id="erF-5c-clc"/>
<outlet property="delegate" destination="Ixy-MR-Jzp" id="2Hw-QW-7TB"/>
</connections>
</tableView>
<navigationItem key="navigationItem" title="Root View Controller" id="Lrj-E3-lJl"/>
</tableViewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="T9r-3a-rLA" userLabel="First Responder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="328" y="517"/>
</scene>
<!--Navigation Controller-->
<scene sceneID="hl3-CB-blQ">
<objects>
<navigationController id="mG9-Ie-ulu" sceneMemberID="viewController">
<navigationBar key="navigationBar" contentMode="scaleToFill" id="ZhA-OA-J4s">
<rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
<autoresizingMask key="autoresizingMask"/>
</navigationBar>
<connections>
<segue destination="Ixy-MR-Jzp" kind="relationship" relationship="rootViewController" id="h4s-cf-6cE"/>
</connections>
</navigationController>
<placeholder placeholderIdentifier="IBFirstResponder" id="it8-XA-fgK" userLabel="First Responder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="-492" y="517"/>
</scene>
</scenes>
<resources>
<image name="image1" width="5000" height="1246"/>
</resources>
</document>
<强>结果
要导入的图像
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