iphone11相機(jī)為什么只能放大5倍？?
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在做掃碼需求，往往會(huì)有放大鏡頭需求。
蘋果提供了AVCaptureConnection中，videoScaleAndCropFactor：縮放裁剪系數(shù),使用該屬性，可以實(shí)現(xiàn)拉近拉遠(yuǎn)鏡頭。再結(jié)合手勢(shì)UIPinchGestureRecognizer，就很簡(jiǎn)單實(shí)現(xiàn)手勢(shì)拉近拉遠(yuǎn)鏡頭。
手勢(shì)代碼
///記錄開始的縮放比例
@property(nonatomic,assign)CGFloat beginGestureScale;
///最后的縮放比例
@property(nonatomic,assign)CGFloat effectiveScale;
- (void)cameraInitOver
{
if (self.isVideoZoom) {
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchDetected:)];
pinch.delegate = self;
[self.view addGestureRecognizer:pinch];
}
}
- (void)pinchDetected:(UIPinchGestureRecognizer*)recogniser
{
self.effectiveScale = self.beginGestureScale * recogniser.scale;
if (self.effectiveScale 1.0){
self.effectiveScale = 1.0;
}
[self.scanObj setVideoScale:self.effectiveScale];
}
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
if ( [gestureRecognizer isKindOfClass:[UIPinchGestureRecognizer class]] ) {
_beginGestureScale = _effectiveScale;
}
return YES;
}
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拉近拉遠(yuǎn)鏡頭代碼
- (void)setVideoScale:(CGFloat)scale
{
[_input.device lockForConfiguration:nil];
AVCaptureConnection *videoConnection = [self connectionWithMediaType:AVMediaTypeVideo fromConnections:[[self stillImageOutput] connections]];
CGFloat maxScaleAndCropFactor = ([[self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo] videoMaxScaleAndCropFactor])/16;
if (scale maxScaleAndCropFactor)
scale = maxScaleAndCropFactor;
CGFloat zoom = scale / videoConnection.videoScaleAndCropFactor;
videoConnection.videoScaleAndCropFactor = scale;
[_input.device unlockForConfiguration];
CGAffineTransform transform = _videoPreView.transform;
[CATransaction begin];
[CATransaction setAnimationDuration:.025];
_videoPreView.transform = CGAffineTransformScale(transform, zoom, zoom);
[CATransaction commit];
}
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有一點(diǎn)需要注意：the videoScaleAndCropFactor property may be set to a value in the range of 1.0 to videoMaxScaleAndCropFactor，videoScaleAndCropFactor這個(gè)屬性取值范圍是1.0-videoMaxScaleAndCropFactor，如果你設(shè)置超出范圍會(huì)崩潰哦！
iOS 模仿微信掃描二維碼放大功能
我們知道，微信掃描二維碼過程中，如果二維碼圖片焦距比較遠(yuǎn)，會(huì)拉近焦距，實(shí)現(xiàn)放大功能。這種效果如何該實(shí)現(xiàn)，用原生的API又是如何實(shí)現(xiàn)。本文簡(jiǎn)單嘗試如何使用AVFoundation實(shí)現(xiàn)放大二維碼圖片。重點(diǎn)是如何定位二維碼和放大二維碼，前面介紹了 iOS 掃描二維碼實(shí)現(xiàn)手勢(shì)拉近拉遠(yuǎn)鏡頭 iOS 識(shí)別過程中描繪二維碼邊框 和iOS 識(shí)別過程中描繪二維碼邊框 ，我們可以很簡(jiǎn)單的實(shí)現(xiàn)二維碼定位和放大。 ...
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Android代碼-Flutter實(shí)現(xiàn)的二維碼掃描。
flutter_mobile_vision Flutter implementation for Google Mobile Vision. Based on Google Mobile Vision
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掃描二維碼研究總結(jié)（高仿微信掃一掃，輕松實(shí)現(xiàn)定制掃描界面）
在正文之前說點(diǎn)題外話，加上這篇我已經(jīng)寫了3篇博客了，其實(shí)我寫博客的初衷不是想證明自己有多牛，并且我也只是從事安卓開發(fā)只有半年時(shí)間的小渣，但是不想成為大牛的渣不是好渣，所以我想通過博客把工作學(xué)習(xí)中遇到的問題進(jìn)行研究總結(jié)，從而提高自己，與此同時(shí)如果能給廣大從事安卓開發(fā)的朋友們提供幫助或者是提供一點(diǎn)點(diǎn)思路我也是很心滿意足了！~~好了，廢話不多少進(jìn)入正題吧！ 先上界面圖。由于目前不會(huì)錄屏，所以直接上截圖...
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ios 掃描二維碼實(shí)現(xiàn)自動(dòng)放大和手勢(shì)雙擊放
[img]魔杖選擇題沒有答案，都是根據(jù)你個(gè)人的情況讓魔杖選擇你的。
分院的題目不是固定的，而是隨機(jī)抽取7道題，而且也沒有固定的標(biāo)準(zhǔn)答案說是選擇哪個(gè)選項(xiàng)必然可以進(jìn)入某個(gè)學(xué)院。我和樓上的童鞋某些題選擇的不一樣，也進(jìn)了拉院。選擇時(shí)要著重考慮可以代表拉文克勞品質(zhì)的選項(xiàng)：睿智、公正、精明、博學(xué)、 聰明、有遠(yuǎn)見、好奇心強(qiáng)，喜歡鉆研等。
有些問題還是很明顯的，比如說：
1 你最討厭別人說你什么：答案有 膽小、自私、平庸、無知。 選無知
2 如果可以研制一種魔藥，你希望它能給與人：友愛、智慧、能量、榮耀。 選智慧
還有些二選一的問題有：
星星/月亮？ 黑色/白色？左邊/右邊？ 硬幣的正面/反面？ 破曉/黃昏？河流/森林？
按照這個(gè)標(biāo)準(zhǔn)并不能百分百進(jìn)入拉院。如果不怕麻煩，可以在進(jìn)入其它學(xué)院之后，關(guān)閉帳號(hào)，重新注冊(cè)，重新分院，直到進(jìn)入拉院為止。
Good luck！
以下是一些國外哈密摘出的問題和部分解析，不是正確答案，只是解析可能性而已，希望能對(duì)大家有所幫助。
When you die what would you most like people to do when they hear your name?
Miss you and smile--Hufflepuff
Ask for more stories about your adventures--Gryffindor
Think in admiration of your achievements--Ravenclaw
I don’t care what people think about me, when after I’m dead it’s when I’m alive that matters—slytherin
Heads or tails?
Heads—Gryffindor/Slytherin
Tails—Hufflepuff/Ravenclaw
Head 正面 -主導(dǎo)型人格的人
Tails 反面 — 聽從或反饋他人行為的人
Stars or Moon?
Stars—Ravenclaw/Gryffindor
Moon—Slytherin/Hufflepuff
月亮代表最深層的個(gè)人需求、基本習(xí)慣和反應(yīng)，以及潛意識(shí)。繁星則寓意真理和良知。
Black or White?
Black –Slytherin/Ravenclaw
White—Gryffindor/Hufflepuff
西洋棋盤中，白棋先行。Ravenclaw和Slytherin是策略型人才，他們喜歡知己知彼，后發(fā)制人。Gryffindor通常會(huì)不計(jì)后果主動(dòng)出擊。
Dawn or Dusk?
Dawn—Gryffindor/Hufflepuff
Dusk—Slytherin/Ravenclaw
破曉寓意新的開始和希望，是樂觀主義者。
黃昏寓意哀傷及過早失望。Ravenclaw求諸事實(shí)，若事態(tài)與愿意相違背，往往會(huì)較他人更早失去希望。Slytherin會(huì)盡力扭轉(zhuǎn)局勢(shì)，以期對(duì)自己有利。一旦察覺大勢(shì)已定，則會(huì)違背初衷隨大流。Griffindor勇敢而堅(jiān)定。Hufflepuff忠貞不二。
Amortenia is a potion that smells of what attracts a person. Would you smell a crackling fire, new parchment, the sea?
Crackling fire—Gryffindor/slytherin
New parchment—Ravenclaw/Hufflepuff
The sea—Gryffindor
Ravenclaw求知欲強(qiáng)烈，Hufflepuff勤奮，Gryffindor勇敢。
以上問題的另一個(gè)版本：
Once every century, the Flutterby Bush produces flowers that adapt their scent to attract the unwary. If it lured you, it would smell of:
The sea
Fresh parchment
Home --Hufflepuff
A crackling log fire
You are walking along and you reach a crossroad one path leads to the sea, one through a forest and a third to a castle. Which path would you choose?
Sea—Gryffindor
Forest--Gryffindor
Castle—Ravenclaw/Slytherin
Ravenclaw渴求真知，城堡是個(gè)遍布寶藏的地方。Slytherin將一切可利用資源為己所用。Gryffindor貌似更喜歡去充滿各種危險(xiǎn)生物的叢林里。
If you could create a new potion that would give you one thing what would you choose?
Love—Gryffindor/Hufflepuff
Glory—Gryffindor/Slytherin
Wisdom--Ravenclaw
If there was a fire and merlin’s book of spells, 1000 years of student record, and a nearly perfected cure for dragonpox were in danger of being destroyed in which order would you choose to save these objects?
Books, Records, Dragonpox—Ravenclaw
Dragonpox, books, records—Slytherin/Ravenclaw
Books, Dragonpox, Records—Ravenclaw/Slytherin
What do you find hardest to deal with?
* boredom
* cold
* hunger
* loneliness
* being ignored
What are you most excited to learn about at Hogwarts?
* Apparition
* Everything magic --Ravenclaw
* Transfiguration
* Flying brooms -- Gryffindor
* Hexes and curses -- Slytherin
* Magical creatures
* Exploring the castle -- Gryffindor
One of you house mates has cheated in a Hogwarts exam by using a self-spelling quill. Now he has come to top of the class in charms, beating you into second place. Professor Flitwick is suspicious of what happened. He draws you to one side after his lesson and asks you whether or not your classmate used a forbidden quill. What do you do?
-Lie and say you don’t know (but hope that somebody else tells Professor Flitwick the truth.)
-Tell Professor Flitwick that he ought to ask your classmate (and resolve to tell your classmate that if he doesn’t tell the truth, you will.)
-Tell Professor Flitwick the truth. If your classmate is prepared to win by cheating, he deserves to be found out. Also, as you are both in the same house, any points he loses will be regained by you, for coming first in his place.
-You would not wait to be asked to tell Professor Flitwick the truth. If you knew that somebody was using a forbidden quill, you would tell the teacher before the exam started.
What do you most want to be known as?
* The good -- Hufflepuff/Gryffindor
* The wise -- Ravenclaw
* The kind -- Hufflepuff
* The great -- Gryffindor/Slytherin
What power would you like to have?
-Invisibility
-Super Strength -- Slytherin
-The ability to change the past -- Slytherin
-The ability to change your appearance at will
-Mind Reading
-The ability to talk to animals
Which road tempts you the most?
-The sunny, grassy lane
-The Narrow dark lantern lit alley
-The twisting leaf-strewn path in the woods
-The cobbled street lined with ancient buildings
Four boxes are placed before you. Which do you open?
-The small tortoiseshell box, embellished with gold, inside which some small creature seems to be squeaking
-The gleaming jet black box with a silver lock and key, marked with a mysterious rune that you know to be the mark of Merlin
-The ornate golden casket, standing on clawed feet, whose inscription warms that both secret knowledge and unbearable temptation lie within
-The small pewter box, unassuming and plain, with a scratched message upon it that reads ‘I only open for the worthy’
Four goblets are placed in front of you, which would you choose to drink?
-Foaming, silvery liquid that sparkles as though containing ground diamonds
-Smooth, thick purple drink that smells of chocolate and plums
-Golden liquid, which makes sun spots dance around the room
-Mysterious black liquid, which gives the drinker strange visions
You are walking along and hear a sound. What do you do?
-Tread cautiously with you hand on your wand
-Retreat and wait for the source of the sound to reveal itself while remembering defensive spells --Slytherin/Ravenclaw
-Seek out the source of the sound -- Gryffindor
Which would you rather be?
-Liked -- Gryffindor/Hufflepuff
-Imitated -- Ravenclaw
-Praised -- Slytherin/Gryffindor
-Envied -- Slytherin/Ravenclaw
-Feared -- Slytherin
-Trusted -- Hufflepuff
A muggle confronts you and says that they are sure you are a witch or wizard. Do you:
-Ask what makes them think so?------ Ravenclaw 好奇
-Agree and walk away, leaving them wondering about the truth?
-Say yes and tell them you’ll jinx them if they don’t leave? ------Slytherin
-Tell them you think perhaps they need to call the mental hospital?
Which magical creatures would you most like to study?
-Centaurs
-Goblins
-Merpeople
-Ghosts
-Vampires
-Werewolves
-Trolls
You and your friends need to cross a bridge guarded by a river troll. He insists that one of you fight him before you can cross. What do you do?
Confuse the troll -- Ravenclaw 運(yùn)用智慧策略誘敵
Have all 3 of you fight (without informing the troll) -- Slytherin 利用聯(lián)合力量
Volunteer to fight -- Gryffindor 勇敢大無畏
Draw lots to see who will fight -- Hufflepuff 抽簽決定 公平公正
我是初學(xué)者小白，所以很多看法不深，理解也不夠透徹。但是很適合小白們一起從低角度往高處探索。文中有錯(cuò)誤的，感謝指正，一起進(jìn)步。
趁著假期做一個(gè)Flutter的地圖功能，因?yàn)楹蠖诉x用了百度地圖，所以前端沒得挑。找了遍插件，并沒有現(xiàn)成可用的。（不過發(fā)現(xiàn)了百度官方也自開發(fā)Flutter插件，目前功能只有一個(gè)獲取本地位置信息，后期會(huì)繼續(xù)增加吧？很期待！）
參考帖子：
這個(gè)實(shí)際上跟功能之間沒太大關(guān)系，只是我按照個(gè)人摸索的過程來寫。
當(dāng)對(duì)一個(gè)“領(lǐng)域/知識(shí)塊”完全不懂的時(shí)候，360°的方向都不確定的話。先了解基礎(chǔ)概念，有利于你確定自己的摸索方向。
參考帖子：
中間我跳過了幾十，上百個(gè)帖子的摸索過程。這個(gè)才是關(guān)鍵能夠真正做事的參考。
因?yàn)榘俣鹊膕dk還算是很完善的，所以一旦出問題，都會(huì)有對(duì)應(yīng)的報(bào)錯(cuò)提示。
我是使用flutter插件：permission_handler，來解決安卓的動(dòng)態(tài)授權(quán)問題，用法簡(jiǎn)單而且設(shè)計(jì)合理。
這個(gè)錯(cuò)誤直接來看，就是簽名有問題。怎么查看SHA1碼和包名，這里不多說，網(wǎng)上有極其多的方法，百度Sdk開發(fā)指南里也有。沒那么復(fù)雜，也沒那么麻煩。按照流程操作就是對(duì)的。
實(shí)在不放心？跟我一樣，flutter打包后，把a(bǔ)pk反過來解SHA1碼不就行了？
參考帖子：
紅色框框基本就是帖子講解的那樣。
藍(lán)色框框見下圖：release標(biāo)簽里好像是自己設(shè)置了。所以debug標(biāo)簽里面，箭頭指向的位置，是我多設(shè)置的一個(gè)參數(shù)。
uid: -1 appid -1 msg: httpsPost failed,IOException:Unable to resolve host "api.map.baidu.com": No address associated with hostname
這一步我是哭笑不得，一開始老是和問題（2）混淆，導(dǎo)致浪費(fèi)很多時(shí)間。仔細(xì)閱讀后，發(fā)現(xiàn)是不能連接到“api.map.baidu.com”。
我打開模擬器的chrome瀏覽器，發(fā)現(xiàn)不能上網(wǎng)。查看手機(jī)的dns是10.0.2.3(默認(rèn)的)，和家里wifi不一樣，所以不能上網(wǎng)也正常，之前居然沒發(fā)現(xiàn)這個(gè)問題?。?！
終端執(zhí)行：adb shell? 和? getprop，就可以查看所有的屬性參數(shù)了。（window小伙伴自行百度，這個(gè)沒多大差別。如果你有多個(gè)設(shè)備，記得自己選好設(shè)備。）
在里面找到這一項(xiàng)，就是你的dns參數(shù)。有些人是net.dns1，我的是net.eth0.dns1。這個(gè)沒關(guān)系，只是等下指令 稍微改動(dòng) 就行。
修改dns指令：setprop net.eth0.dns1 192.168.2.1
后面的192.168.2.1是我自己的dns，這個(gè)根據(jù)自己的情況來填寫。不懂的百度下怎么查看自己的dns。
雖然提示設(shè)置失敗，但是回到模擬器一看，地圖已經(jīng)顯示出來了。
嘿嘿，在flutter設(shè)定多大的區(qū)域，地圖就是多大的區(qū)域。用起來就很方便了。
過程十分痛苦，因?yàn)閷?duì)flutter不是很熟悉，對(duì)Android原生更是了解很少。所以自己就像突然不能講話，被丟到一個(gè)陌生的環(huán)境，卻要我去找一個(gè)人。所以細(xì)心很重要，一定要看清楚錯(cuò)誤提示，不要錯(cuò)過每一個(gè)細(xì)節(jié)和可能性。
幸好最后解決了問題，開心~
其實(shí)如果你仔細(xì)閱讀過百度官方的文檔，會(huì)發(fā)現(xiàn)里面有關(guān)于 地圖的生命周期管理 。然后在這里面沒有提及到，這一點(diǎn)雖然沒提，但不可或缺，小伙伴就自行思考吧。
最后還有一點(diǎn)，其實(shí)我的初衷是想實(shí)現(xiàn)一個(gè)百度地圖的plugin，但是苦于能力有限，對(duì)Android的不熟悉，最后折戟。我不得已另起項(xiàng)目，然后重新實(shí)現(xiàn)地圖sdk接入。經(jīng)過這次對(duì)于這些有更多更全面的認(rèn)知后，有空會(huì)再次研究flutter 插件的開發(fā)，共勉，奧利給?。。?/p>
網(wǎng)站題目：flutter初衷,flutterin
轉(zhuǎn)載來源：http://weahome.cn/article/dsopipo.html
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