SwiftUI组件-AsyncImage

import SwiftUI

struct AsyncImageBootcamp: View {
    let url = URL(string: "https://picsum.photos/200")
    var body: some View {
        /// Mark - iOS15 以后才有的方法
        ScrollView {
            AsyncImage(url: url, content: { returnImage in
                returnImage
                    .resizable()
                    .scaledToFit()
                    .frame(width: 100, height: 100)
                    .cornerRadius(10)
            }, placeholder: {
                ProgressView()
            })
            
            AsyncImage(url: url, scale: 1.0)
            
            AsyncImage(url: url) { phase in
                switch phase {
                case .empty:
                    ProgressView()
                case .success(let returnImage):
                    returnImage
                        .resizable()
                        .scaledToFit()
                        .frame(width: 100, height: 100)
                        .cornerRadius(10)
                case .failure(let error):
                    Image(systemName: "questionmark")
                @unknown default:
                    Image(systemName: "questionmark")
                }
            }
        }
    }
}

#Preview {
    AsyncImageBootcamp()
}

效果如下：