utils.js
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import qrcode from './qrcode';//用于绘制二维码
// 保存图片
let settingWritePhotosAlbum = false;
export const saveImg = function(url,callback) {
if (url) {
// #ifdef MP-WEIXIN
if (settingWritePhotosAlbum) {
uni.getSetting({
success: res => {
if (res.authSetting['scope.writePhotosAlbum']) {
uni.showLoading({
title: '正在下载'
});
uni.downloadFile({
url: url,
success: data => {
if (data.statusCode == 200) {
uni.saveImageToPhotosAlbum({
filePath: data.tempFilePath,
success: () => {
uni.hideLoading();
callback && callback();
uni.showToast({
title: '保存成功'
});
},
fail(e) {
uni.hideLoading();
tip({
title: '下载失败，错误原因：' + e.errMsg,
icon: "none"
});
}
});
} else {
uni.hideLoading();
uni.showToast({
title: '下载失败',
icon: "none"
});
}
},
fail(e) {
uni.hideLoading();
uni.showToast({
title: '下载失败，错误原因：' + e.errMsg,
icon: "none"
});
}
});
} else {
uni.showModal({
title: '提示',
content: '请先在设置页面打开“保存相册”使用权限',
confirmText: '去设置',
cancelText: '算了',
success: data => {
if (data.confirm) {
uni.openSetting();
}
}
});
}
}
});
} else {
settingWritePhotosAlbum = true;
uni.authorize({
scope: 'scope.writePhotosAlbum',
success: () => {
uni.showLoading({
title: '正在下载'
});
uni.downloadFile({
url: url,
success: data => {
if (data.statusCode == 200) {
uni.saveImageToPhotosAlbum({
filePath: data.tempFilePath,
success: () => {
uni.hideLoading();
callback && callback();
uni.showToast({
title: '保存成功'
});
},
fail(e) {
uni.hideLoading();
tip({
title: '下载失败，错误原因：' + e.errMsg,
icon: "none"
});
}
});
} else {
uni.hideLoading();
uni.showToast({
title: '下载失败',
icon: "none"
});
}
},
fail(e) {
uni.hideLoading();
uni.showToast({
title: '下载失败，错误原因：' + e.errMsg,
icon: "none"
});
}
});
}
});
}
// #endif
// #ifdef H5
uni.showLoading({
title: '正在下载'
});
uni.downloadFile({
url: url,
success: data => {
uni.hideLoading();
if (data.statusCode == 200) {
callback && callback();
window.open(data.tempFilePath);
} else {
uni.showToast({
title: '下载失败',
icon: "none"
});
}
},
fail(e) {
uni.hideLoading();
uni.showToast({
title: '下载失败，错误原因：' + e.errMsg,
icon: "none"
});
}
});
// #endif
// #ifdef APP-PLUS || MP-ALIPAY
uni.showLoading({
title: '正在下载'
});
uni.saveImageToPhotosAlbum({
filePath: url,
success: () => {
uni.hideLoading();
callback && callback();
uni.showToast({
title: '保存成功'
});
},
fail(e) {
uni.hideLoading();
uni.showToast({
title: '下载失败，错误原因：' + e.errMsg,
icon: "none"
});
}
});
// #endif
} else {
uni.showToast({
title: '未找到图片',
icon: 'none'
});
}
};
// 绘制二维码
export const qrcodeCanvas = function(id, code, width, height, that) {
qrcode.api.draw(code, {
ctx: uni.createCanvasContext(id, that),
width: convert_length(width),
height: convert_length(height)
})
}
function convert_length(length) {
return Math.round(uni.getSystemInfoSync().windowWidth * length / 750);
}