小程序-保存图片，用户授权，拒绝授权等操作
<image class='recode' data-img='{{dataInfo.qrcode}}' bindtap='onSavePicClick' src='{{dataInfo.qrcode}}'></image>
1、用户点击图片弹出授权框
2、网络路径图片
3、用户点击了拒绝
4、getSetting事件需要tap触发
downloadImage: function (imageUrl) {
// 下载文件
wx.downloadFile({
url: imageUrl,
success: function (res) {
// 保存图片到系统相册
wx.saveImageToPhotosAlbum({
filePath: res.tempFilePath,
success(res) {
wx.showToast({
title: '保存成功',
});
},
fail(res) {
console.log("保存图片：fail");
}
})
},
fail: function (res) {
console.log("下载文件：fail");
}
})
},
onSavePicClick: function (e) {
var that = this;
console.log("onSavePicClick");
console.log(e);
var downloadUrl = e.currentTarget.dataset.img;
if (!wx.saveImageToPhotosAlbum) {
wx.showModal({
title: '提示',
content: '当前微信版本过低，无法使用该功能，请升级到最新微信版本后重试。'
})
return;
}
// 可以通过 wx.getSetting 先查询一下用户是否授权了 "scope.writePhotosAlbum" 这个 scope
wx.getSetting({
success(res) {
console.log("getSetting: success");
if (!res.authSetting['scope.writePhotosAlbum']) {
// 接口调用询问
wx.authorize({
scope: 'scope.writePhotosAlbum',
success() {
that.downloadImage(downloadUrl);
},
fail() {
// 用户拒绝了授权
wx.showModal({
title: '保存图片',
content: '保存图片需要您授权',
showCancel: true,
confirmText: '确定',
success: function (res) {
if (res.confirm) {
// 打开设置页面
wx.openSetting({
success: function (data) {
if (data.authSetting['scope.writePhotosAlbum']) {
that.downloadImage(downloadUrl);
} else {
console.log("授权失败");
}
},
fail: function (data) {
console.log("openSetting: fail");
}
});
} else if (res.cancel) {
console.log('用户点击取消')
}
}
})
}
})
} else {
that.downloadImage(downloadUrl)
}
},
fail(res) {
console.log("getSetting: fail");
console.log(res);
}
})
},
downloadImage: function (imageUrl) {
// 下载文件
wx.downloadFile({
url: imageUrl,
success: function (res) {
console.log("下载文件：success");
console.log(res);
// 保存图片到系统相册
wx.saveImageToPhotosAlbum({
filePath: res.tempFilePath,
success(res) {
console.log("保存图片：success");
wx.showToast({
title: '保存成功',
});
},
fail(res) {
console.log("保存图片：fail");
console.log(res);
}
})
},
fail: function (res) {
console.log("下载文件：fail");
console.log(res);
}
})
},
onSavePicClick: function (e) {
var that = this;
console.log("onSavePicClick");
console.log(e);
var downloadUrl = e.currentTarget.dataset.img;
if (!wx.saveImageToPhotosAlbum) {
wx.showModal({
title: '提示',
content: '当前微信版本过低，无法使用该功能，请升级到最新微信版本后重试。'
})
return;
}
// 可以通过 wx.getSetting 先查询一下用户是否授权了 "scope.writePhotosAlbum" 这个 scope
wx.getSetting({
success(res) {
console.log("getSetting: success");
if (!res.authSetting['scope.writePhotosAlbum']) {
// 接口调用询问
wx.authorize({
scope: 'scope.writePhotosAlbum',
success() {
that.downloadImage(downloadUrl);
},
fail() {
// 用户拒绝了授权
wx.showModal({
title: '保存图片',
content: '保存图片需要您授权',
showCancel: true,
confirmText: '确定',
success: function (res) {
if (res.confirm) {
console.log(12134);
// 打开设置页面
wx.openSetting({
success: function (data) {
if (data.authSetting['scope.writePhotosAlbum']) {
console.log("授权成功");
that.downloadImage(downloadUrl);
} else {
console.log("授权失败");
}
},
fail: function (data) {
console.log("openSetting: fail");
}
});
} else if (res.cancel) {
console.log('用户点击取消')
}
}
})
}
})
} else {
that.downloadImage(downloadUrl)
}
},
fail(res) {
console.log("getSetting: fail");
console.log(res);
}
})
},