1崔列、設(shè)置navigationBar title的顏色
UIColor *whiteColor = [UIColor whiteColor];
NSDictionary *dic = [NSDictionary dictionaryWithObject:whiteColor forKey:NSForegroundColorAttributeName];
[self.navigationController.navigationBar setTitleTextAttributes:dic];
2腊满、修改textField的placeholder的字體顏色钢拧、大小
a.通過(guò)kvo設(shè)置
self.textField.placeholder = @"請(qǐng)輸入商品名稱(chēng)";
[self.textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
[self.textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];
b.通過(guò)富文本設(shè)置
NSString *string = @"請(qǐng)輸入商品名稱(chēng)";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
[attributedString addAttribute:NSForegroundColorAttributeName
value:[UIColor redColor]
range:NSMakeRange(0, [string length])];
[attributedString addAttribute:NSFontAttributeName
value:[UIFont systemFontOfSize:16]
range:NSMakeRange(0, [string length])];
self.textField.attributedPlaceholder = attributedString;
3雄妥、關(guān)閉/收起鍵盤(pán)方法
a.點(diǎn)擊Return按扭時(shí)收起鍵盤(pán)
-(BOOL)textFieldShouldReturn:(UITextField*)textField{
return [textField resignFirstResponder];
}
b.點(diǎn)擊背景View收起鍵盤(pán)
[self.view endEditing:YES];
c.在任何地方統(tǒng)一收起鍵盤(pán)
[[[UIApplication sharedApplication] keyWindow] endEditing:YES];
4最蕾、將color轉(zhuǎn)為UIImage
-(UIImage*)createImageWithColor:(UIColor*)color{
CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}
5、NSString進(jìn)行URL編碼轉(zhuǎn)換
urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
6老厌、清理內(nèi)存
// 清理內(nèi)存
[[SDImageCache sharedImageCache] clearMemory];
// 清理webview 緩存
NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (NSHTTPCookie *cookie in [storage cookies]) {
[storage deleteCookie:cookie];
}
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
[config.URLCache removeAllCachedResponses];
[[NSURLCache sharedURLCache] removeAllCachedResponses];
// 清理硬盤(pán)
[[SDImageCache sharedImageCache] clearDiskOnCompletion:^{
[MBProgressHUD hideAllHUDsForView:self.view animated:YES];
[self.tableView reloadData];
}];
7瘟则、返回一個(gè)沒(méi)有重復(fù)元素的數(shù)組
-(NSArray *)arrayWithMemberIsOnly:(NSArray *)array{
NSMutableArray *categoryArray = [[NSMutableArray alloc] init];
for (unsigned i = 0; i < [array count]; i++) {
if ([categoryArray containsObject:[array objectAtIndex: i]] == NO) {
[categoryArray addObject:[array objectAtIndex: i]];
}
}
return categoryArray;
}
8、限制UITextField字?jǐn)?shù)
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
if (textField.text.length + string.length > 18) {
return NO;
}
if (textField.text.length < range.location + range.length) {
return NO;
}
return YES;
}
9枝秤、隱私數(shù)據(jù)訪(fǎng)問(wèn)問(wèn)題
項(xiàng)目中訪(fǎng)問(wèn)了隱私數(shù)據(jù),比如:相機(jī),相冊(cè),聯(lián)系人等,在Xcode8中打開(kāi)編譯的話(huà),統(tǒng)統(tǒng)會(huì)crash.提交App Store會(huì)被拒絕醋拧，可以才info.plist中添加如下設(shè)置：
<!-- 相冊(cè) -->
<key>NSPhotoLibraryUsageDescription</key>
<string>App需要您的同意,才能訪(fǎng)問(wèn)相冊(cè)</string>
<!-- 相機(jī) -->
<key>NSCameraUsageDescription</key>
<string>App需要您的同意,才能訪(fǎng)問(wèn)相機(jī)</string>
<!-- 麥克風(fēng) -->
<key>NSMicrophoneUsageDescription</key>
<string>App需要您的同意,才能訪(fǎng)問(wèn)麥克風(fēng)</string>
<!-- 位置 -->
<key>NSLocationUsageDescription</key>
<string>App需要您的同意,才能訪(fǎng)問(wèn)位置</string>
<!-- 在使用期間訪(fǎng)問(wèn)位置 -->
<key>NSLocationWhenInUseUsageDescription</key>
<string>App需要您的同意,才能在使用期間訪(fǎng)問(wèn)位置</string>
<!-- 始終訪(fǎng)問(wèn)位置 -->
<key>NSLocationAlwaysUsageDescription</key>
<string>App需要您的同意,才能始終訪(fǎng)問(wèn)位置</string>
<!-- 日歷 -->
<key>NSCalendarsUsageDescription</key>
<string>App需要您的同意,才能訪(fǎng)問(wèn)日歷</string>
<!-- 提醒事項(xiàng) -->
<key>NSRemindersUsageDescription</key>
<string>App需要您的同意,才能訪(fǎng)問(wèn)提醒事項(xiàng)</string>
<!-- 運(yùn)動(dòng)與健身 -->
<key>NSMotionUsageDescription</key> <string>App需要您的同意,才能訪(fǎng)問(wèn)運(yùn)動(dòng)與健身</string>
<!-- 健康更新 -->
<key>NSHealthUpdateUsageDescription</key>
<string>App需要您的同意,才能訪(fǎng)問(wèn)健康更新 </string>
<!-- 健康分享 -->
<key>NSHealthShareUsageDescription</key>
<string>App需要您的同意,才能訪(fǎng)問(wèn)健康分享</string>
<!-- 藍(lán)牙 -->
<key>NSBluetoothPeripheralUsageDescription</key>
<string>App需要您的同意,才能訪(fǎng)問(wèn)藍(lán)牙</string>
<!-- 媒體資料庫(kù) -->
<key>NSAppleMusicUsageDescription</key>
<string>App需要您的同意,才能訪(fǎng)問(wèn)媒體資料庫(kù)</string>
10、銀行卡校驗(yàn)碼算法
-(void)getBankCardCheckCode{
NSString *cardNumber = @"625965087177209";
NSMutableString *checkCode = [NSMutableString string];
//校驗(yàn)碼為銀行卡號(hào)最后一位淀弹，采用LUHN算法丹壕，亦稱(chēng)模10算法。計(jì)算方法如下：
for (NSInteger i = 0; i < cardNumber.length; i+=2) {
//第一步：從右邊第1個(gè)數(shù)字開(kāi)始每隔一位乘以2薇溃；
NSString *str = [cardNumber substringWithRange:NSMakeRange(i, 1)];
[checkCode appendString:[NSString stringWithFormat:@"%ld", [str integerValue] * 2]];
}
NSInteger sum = 0;
for (NSInteger i = 0; i < checkCode.length; i++) {
//第二步： a.把在第一步中獲得的乘積的各位數(shù)字相加菌赖，然
NSInteger number = [[checkCode substringWithRange:NSMakeRange(i, 1)] integerValue];
sum += number;
}
for (NSInteger i = 1; i < cardNumber.length; i+=2) {
//b.后再與原號(hào)碼中未乘2的各位數(shù)字相加；
NSInteger number = [[cardNumber substringWithRange:NSMakeRange(i, 1)] integerValue];
sum += number;
}
//第三步：對(duì)于第二步求和值中個(gè)位數(shù)求10的補(bǔ)數(shù)沐序，如果個(gè)位數(shù)為0則該校驗(yàn)碼為0琉用。
NSInteger code = 10 - (sum%10);
NSString *fullCardNumber = [NSString stringWithFormat:@"%@%ld", cardNumber, code];
NSLog(@"fullCardNumber:%@", fullCardNumber);
}
11、設(shè)置label文字屬性策幼，一半斜體一半sys邑时，一半紅色，一半黑色
_starGoodsLabel = [[UILabel alloc] init];
CGAffineTransform matrix = CGAffineTransformMake(1, 0, tanf(15 * (CGFloat)M_PI / 180), 1, 0, 0);
UIFontDescriptor *desc = [ UIFontDescriptor fontDescriptorWithName :[ UIFont systemFontOfSize :17 ]. fontName matrix :matrix];
_starGoodsLabel.font = [ UIFont fontWithDescriptor :desc size :17];
_starGoodsLabel.textColor = [UIColor redColor];
NSString *string = @"/ 底價(jià)秒殺 / 人人都在搶的貨";
NSMutableAttributedString *str = [[NSMutableAttributedString alloc]initWithString:string];
[str addAttribute:NSForegroundColorAttributeName value:RGB(68, 68, 68) range:NSMakeRange(10, string.length - 10)];
[str addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:12] range:NSMakeRange(10, string.length - 10)];
_starGoodsLabel.attributedText = str;
[view addSubview:_starGoodsLabel];
[_starGoodsLabel mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(self.contentView.mas_left).offset(10);
make.right.mas_equalTo(self.contentView.mas_right).offset(-120);
make.top.mas_equalTo(self.contentView.mas_top).offset(7);
make.height.equalTo(@14);
}];
12特姐、截圖
//截取view生成一張圖片
+ (UIImage *)shotWithView:(UIView *)view{
UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
//截取view中某個(gè)區(qū)域生成一張圖片
+ (UIImage *)shotWithView:(UIView *)view scope:(CGRect)scope{
CGImageRef imageRef = CGImageCreateWithImageInRect([self shotWithView:view].CGImage, scope);
UIGraphicsBeginImageContext(scope.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGRect rect = CGRectMake(0, 0, scope.size.width, scope.size.height);
CGContextTranslateCTM(context, 0, rect.size.height);//下移
CGContextScaleCTM(context, 1.0f, -1.0f);//上翻
CGContextDrawImage(context, rect, imageRef);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGImageRelease(imageRef);
CGContextRelease(context);
return image;
}
13晶丘、日期與時(shí)間戳互轉(zhuǎn)
//將時(shí)間戳轉(zhuǎn)換為NSDate類(lèi)型
-(NSDate*)getDateTimeFromMilliSeconds:(long long)miliSeconds{
NSTimeInterval tempMilli = miliSeconds;
NSTimeInterval seconds = tempMilli/1000.0;//這里的.0一定要加上，不然除下來(lái)的數(shù)據(jù)會(huì)被截?cái)鄬?dǎo)致時(shí)間不一致
NSLog(@"傳入的時(shí)間戳=%f", seconds);
return [NSDate dateWithTimeIntervalSince1970: seconds];
}
//將NSDate類(lèi)型的時(shí)間轉(zhuǎn)換為時(shí)間戳,從1970/1/1開(kāi)始
-(long long)getDateTimeTOMilliSeconds:(NSDate*)datetime{
NSTimeInterval interval = [datetime timeIntervalSince1970];
NSLog(@"轉(zhuǎn)換的時(shí)間戳=%f", interval);
long long totalMilliseconds = interval*1000;
NSLog(@"totalMilliseconds=%llu", totalMilliseconds);
return totalMilliseconds;
}
14唐含、指紋識(shí)別返回碼
a铣口、 驗(yàn)證（指紋/密碼）不能開(kāi)啟的錯(cuò)誤信息(指紋系統(tǒng)被判定為無(wú)效):
LAErrorPasscodeNotSet : 設(shè)備密碼未設(shè)置
LAErrorTouchIDNotAvailable : TOUCH ID不可用
LAErrorTouchIDNotEnrolled : 指紋未錄入
LAErrorTouchIDLockout : TOUCH ID被鎖定
LAErrorAppCancel : APP調(diào)用了- (void)invalidate方法使LAContext失效
LAErrorInvalidContext : 實(shí)例化的LAContext對(duì)象失效滤钱，再次調(diào)用evaluation...方法則會(huì)彈出此錯(cuò)誤信息
b、 其他錯(cuò)誤信息(指紋系統(tǒng)判定有效脑题，但是驗(yàn)證指紋錯(cuò)誤):
LAErrorAuthenticationFailed : 鑒定失敗
LAErrorUserCancel : 用戶(hù)取消
LAErrorUserFallback : 用戶(hù)選擇輸入密碼
LAErrorSystemCancel : 系統(tǒng)取消（如：另外一個(gè)應(yīng)用進(jìn)入前臺(tái)）
15、解決tableView分隔線(xiàn)少一段的方法
在ios7中铜靶，UITableViewCell左側(cè)會(huì)有默認(rèn)15像素的空白叔遂。這時(shí)候，設(shè)置setSeparatorInset:UIEdgeInsetsZero能將空白去掉争剿。
但是在ios8中已艰，設(shè)置setSeparatorInset:UIEdgeInsetsZero已經(jīng)不起作用了。下面是解決辦法
首先在viewDidLoad方法加入以下代碼：
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {
[self.tableView setSeparatorInset:UIEdgeInsetsZero];
}
然后在UITableView的代理方法中加入以下代碼
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
[cell setSeparatorInset:UIEdgeInsetsZero];
}
}
