ios基礎考試題1，實現按鈕點擊改變位置和圖片的透明度和動畫的使用

考察frame，center，bounds的坐標，改變，動畫的使用，圖片容器的UIImageView的透明度等知識
oc寫法

// // ViewController.m // kaoshiTi1 // // Created by lujun on 2021/5/19. //#import "ViewController.h"@interface ViewController () @property (weak, nonatomic) IBOutlet UIImageView *babyView;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad]; } - (IBAction)click:(id)sender {CGRect rect = self.babyView.frame;rect.origin.y =self.view.frame.size.height;self.babyView.frame = rect;self.babyView.alpha = 1.0;[UIView animateWithDuration:0.5 animations:^{CGPoint pCenter = self.babyView.center;pCenter.y = self.view.frame.size.height * 0.5;self.babyView.center = pCenter;} completion:^(BOOL finished) {[UIView animateWithDuration:1.0 animations:^{self.babyView.alpha = 0.0;}];}]; } @end

斯為芙特寫法

// // ViewController.swift // 01-考試題1 // // Created by lujun on 2021/5/19. // import UIKit class ViewController: UIViewController {@IBOutlet weak var babyView: UIImageView!@IBAction func click(_ sender: Any) {self.babyView.frame.origin.y = self.view.frame.heightself.babyView.alpha = 1.0UIView.animate(withDuration: 0.25) {self.babyView.center.y = self.view.frame.height * 0.5} completion: { (finished: Bool) inUIView.animate(withDuration: 1.0) {self.babyView.alpha = 0.0}} }override func viewDidLoad() {super.viewDidLoad()} }

總結

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