注意點(diǎn)
1、使用ALAssetsLibrary需要強(qiáng)引用强霎。
2、使用changeDetailsForFetchResult:時(shí)蓉冈，PHFetchResult要強(qiáng)引用城舞。
3、textField相關(guān)
3.1寞酿、textField右對(duì)齊狀態(tài)下家夺，輸入空格后，光標(biāo)跳轉(zhuǎn)至左側(cè)伐弹。
3.2拉馋、textField右對(duì)齊狀態(tài)下，手寫輸入會(huì)產(chǎn)生一個(gè)中文空格惨好。
3.3椅邓、直接對(duì)textField.text賦值光標(biāo)會(huì)跳到右側(cè)。
3.4昧狮、textField:shouldChangeCharactersInRange:replacementString:方法在iOS10之前輸入中文不會(huì)觸發(fā)景馁。
3.5、textField右對(duì)齊狀態(tài)下逗鸣，在光標(biāo)前面無(wú)字符的情況下合住，無(wú)法輸入空格绰精，需使用\u00a0替代。
4透葛、使用ALAssetsLibrary獲取到image后直接使用笨使，當(dāng)在PC端刪除圖片并在手機(jī)端使用Layer動(dòng)畫時(shí)，Cell會(huì)閃爍僚害。
5硫椰、轉(zhuǎn)場(chǎng)動(dòng)畫過(guò)程中截屏需使用GCD，否則有可能會(huì)有黑屏萨蚕。
// To avoid a blank snapshot, defer snapshotting the incoming view until it
// has had a chance to perform layout and drawing (1 run-loop cycle).
dispatch_async(dispatch_get_main_queue(), ^{
UIGraphicsBeginImageContextWithOptions(containerView.bounds.size, YES, containerView.window.screen.scale);
[toView drawViewHierarchyInRect:containerView.bounds afterScreenUpdates:NO];
toViewSnapshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
});
6靶草、刪除cookie
NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
NSArray *cookies = [[storage cookies] copy];
for (NSHTTPCookie *cookie in cookies) {
[storage deleteCookie:cookie];
}
7、web認(rèn)證
UIWebView:使用NSURLConnection
WKWebView:使用
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential *))completionHandler {
}
8岳遥、使用FLEX時(shí)奕翔，在轉(zhuǎn)場(chǎng)動(dòng)畫時(shí)旋轉(zhuǎn)屏幕，
iOS8狀態(tài)欄會(huì)跟著轉(zhuǎn)
iOS9以上浩蓉，屏幕會(huì)一起轉(zhuǎn)派继，出現(xiàn)黑屏
9、
NSString *someString = nil;
if (NSNotFound != [someString rangeOfString:@"swift"].location) {
NSLog(@"Someone mentioned swift!");
}
如果 someString 是 nil捻艳，那么 rangeOfString: 消息將返回一個(gè)值都為零的NSRange驾窟。也就是說(shuō).location 將為零，而 NSNotFound 被定義為 NSIntegerMax认轨。這樣一來(lái)绅络，當(dāng) someString 是 nil 時(shí)，if 語(yǔ)句的內(nèi)容將被執(zhí)行好渠。
小技巧
1昨稼、橫屏顯示狀態(tài)欄
非劉海屏：
[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];
劉海屏：
暫時(shí)沒(méi)有辦法节视，下圖是蘋果給的答復(fù)拳锚。
WechatIMG381.jpeg
2、設(shè)置UserAgent
[self.webViewAdapter stringByJavaScriptFromString:@"navigator.userAgent" handler:^(id _Nonnull result) {
NSString *appCurVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
NSString *UserAgentValue = [NSString stringWithFormat:@"XXX %@ %@", appCurVersion, result];
NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:UserAgentValue, @"UserAgent", nil];
[[NSUserDefaults standardUserDefaults] registerDefaults:dictionary];
[[NSUserDefaults standardUserDefaults] synchronize];
ws.webViewAdapter = nil;
}];
3寻行、設(shè)置textField光標(biāo)位置
@interface UITextField (Cursor)
- (NSInteger)cursorIndex;
- (void)setCursorIndex:(NSInteger)index;
@end
@implementation UITextField (Cursor)
- (NSInteger)cursorIndex {
UITextPosition *beginning = self.beginningOfDocument;
UITextRange *selectedRange = self.selectedTextRange;
UITextPosition *selectionStart = selectedRange.start;
return [self offsetFromPosition:beginning toPosition:selectionStart];
}
- (void)setCursorIndex:(NSInteger)index {
UITextPosition *beginning = self.beginningOfDocument;
UITextPosition *position = [self positionFromPosition:beginning offset:index];
UITextRange *selectionRange = [self textRangeFromPosition:position toPosition:position];
[self setSelectedTextRange:selectionRange];
}
@end
4霍掺、判斷字符串是否包含Emoji
@interface NSString (Emoji)
+ (BOOL)stringContainsEmoji:(NSString *)string;
@end
@implementation NSString (Emoji)
+ (BOOL)stringContainsEmoji:(NSString *)string {
__block BOOL containsEmoji = NO;
[string enumerateSubstringsInRange:NSMakeRange(0, [string length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
const unichar hs = [substring characterAtIndex:0];
// surrogate pair
if (0xd800 <= hs && hs <= 0xdbff) {
if (substring.length > 1) {
const unichar ls = [substring characterAtIndex:1];
const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
if (0x1d000 <= uc && uc <= 0x1f9c0) {
containsEmoji = YES;
}
}
} else if (substring.length > 1) {
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3 || ls == 0xfe0f || ls == 0xd83c) {
containsEmoji = YES;
}
} else {
// non surrogate
if (0x2100 <= hs && hs <= 0x278a) {
containsEmoji = YES;
} else if (0x2793 <= hs && hs <= 0x27ff) {
containsEmoji = YES;
} else if (0x2B05 <= hs && hs <= 0x2b07) {
containsEmoji = YES;
} else if (0x2934 <= hs && hs <= 0x2935) {
containsEmoji = YES;
} else if (0x3297 <= hs && hs <= 0x3299) {
containsEmoji = YES;
} else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {
containsEmoji = YES;
}
}
if (containsEmoji) {
*stop = YES;
}
}];
return containsEmoji;
}
@end
5.1、給WKWebView添加Cookie
NSMutableURLRequest *mutableURLRequest = [[NSMutableURLRequest alloc] initWithURL:request.URL];
NSString *cookie = [self p_getCurrentCookieWithUrl:request.URL];
if (![cookie isEqualToString:@""]) {
[mutableURLRequest addValue:cookie forHTTPHeaderField:@"Cookie"];
}
[self.wkWebView loadRequest:mutableURLRequest];
- (NSString *)p_getCurrentCookieWithUrl:(NSURL *)url {
NSMutableString *cookieStr = [[NSMutableString alloc] init];
NSArray *array = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:url];
if ([array count] > 0) {
for (NSHTTPCookie *cookie in array) {
[cookieStr appendFormat:@"%@=%@;",cookie.name, cookie.value];
}
[cookieStr deleteCharactersInRange:NSMakeRange(cookieStr.length - 1, 1)];
}
return cookieStr;
}
6拌蜘、使用動(dòng)態(tài)閾值加載數(shù)據(jù)
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat threshold = 0.7;
CGFloat itemPerPage = 10;
CGFloat current = scrollView.contentOffset.y + scrollView.frame.size.height;
CGFloat total = scrollView.contentSize.height;
CGFloat ratio = current / total;
CGFloat needRead = [self.dataArray count] - itemPerPage * (1 - threshold) + 1;
CGFloat totalItem = [self.dataArray count] + 1;
CGFloat newThreshold = needRead / totalItem;
if (ratio >= newThreshold) {
// load next page
}
}
7杆烁、查看源碼
clang -rewrite-objc main.m
8、升級(jí)了Xcode并且改了名
sudo xcode-select -switch /Applications/Xcode8.3.app/Contents/Developer
9简卧、WKWebview中部分鏈接無(wú)法打開(kāi)
- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures {
if (!navigationAction.targetFrame) {
[webView loadRequest:navigationAction.request];
}
return nil;
}
10兔魂、安裝cocoapods
sudo gem install -n /usr/local/bin cocoapods
11、獲取當(dāng)前的Wifi名
- (NSString *)getCurrentWifiHotSpotName {
NSString *wifiName = nil;
NSArray *ifs = (__bridge_transfer id)CNCopySupportedInterfaces();
for (NSString *ifnam in ifs) {
NSDictionary *info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
if (info[@"SSID"]) {
wifiName = info[@"SSID"];
}
}
return wifiName;
}
12举娩、連接Wifi（iOS 11）
1）打開(kāi)Capabilities中的Hotspot Configuration
An application that needs access to the NEHotspotConfiguration API must have
the “com.apple.developer.networking.HotspotConfiguration” entitlement.
2）連接代碼
if (@available(iOS 11.0, *)) {
NEHotspotConfiguration *hotspotConfig = [[NEHotspotConfiguration alloc] initWithSSID:@"123" passphrase:@"12356789" isWEP:NO];
NEHotspotConfigurationManager *hotspotManager = [NEHotspotConfigurationManager sharedManager];
[hotspotManager applyConfiguration:hotspotConfig completionHandler:^(NSError * _Nullable error) {
NSLog(@"%@", error ? : @"Success");
}];
} else {
NSLog(@"系統(tǒng)版本低于iOS 11.");
}
未完待續(xù) 析校、
