iOS小技巧总结,绝对有你想要的(上)
转载自Cocoa China,原文地址:http://www.cocoachina.com/ios/20170504/19179.html
在这里总结一些iOS开发中的小技巧,能大大方便我们的开发,持续更新。
UITableView的Group样式下顶部空白处理
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//分组列表头部空白处理
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 0.1)];
self.tableView.tableHeaderView = view;
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UITableView的plain样式下,取消区头停滞效果
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat sectionHeaderHeight = sectionHead.height;
if (scrollView.contentOffset.y=0)
{
scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
}
else if (scrollView.contentOffset.y>=sectionHeaderHeight)
{
scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);
}
}
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那个,其实,还是用Group样式吧哈哈。
获取某个view所在的控制器
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- (UIViewController *)viewController
{
UIViewController *viewController = nil;
UIResponder *next = self.nextResponder;
while (next)
{
if ([next isKindOfClass:[UIViewController class]])
{
viewController = (UIViewController *)next;
break ;
}
next = next.nextResponder;
}
return viewController;
}
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两种方法删除NSUserDefaults所有记录
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//方法一
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
//方法二
- (void)resetDefaults
{
NSUserDefaults * defs = [NSUserDefaults standardUserDefaults];
NSDictionary * dict = [defs dictionaryRepresentation];
for (id key in dict)
{
[defs removeObjectForKey:key];
}
[defs synchronize];
}
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打印系统所有已注册的字体名称
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#pragma mark - 打印系统所有已注册的字体名称
void enumerateFonts()
{
for (NSString *familyName in [UIFont familyNames])
{
NSLog(@ "%@" ,familyName);
NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName];
for (NSString *fontName in fontNames)
{
NSLog(@ "\t|- %@" ,fontName);
}
}
}
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取图片某一像素点的颜色 在UIImage的分类中
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- (UIColor *)colorAtPixel:(CGPoint)point
{
if (!CGRectContainsPoint(CGRectMake(0.0f, 0.0f, self.size.width, self.size.height), point))
{
return nil;
}
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
int bytesPerPixel = 4;
int bytesPerRow = bytesPerPixel * 1;
NSUInteger bitsPerComponent = 8;
unsigned char pixelData[4] = {0, 0, 0, 0};
CGContextRef context = CGBitmapContextCreate(pixelData,
1,
1,
bitsPerComponent,
bytesPerRow,
colorSpace,
kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colorSpace);
CGContextSetBlendMode(context, kCGBlendModeCopy);
CGContextTranslateCTM(context, -point.x, point.y - self.size.height);
CGContextDrawImage(context, CGRectMake(0.0f, 0.0f, self.size.width, self.size.height), self.CGImage);
CGContextRelease(context);
CGFloat red = (CGFloat)pixelData[0] / 255.0f;
CGFloat green = (CGFloat)pixelData[1] / 255.0f;
CGFloat blue = (CGFloat)pixelData[2] / 255.0f;
CGFloat alpha = (CGFloat)pixelData[3] / 255.0f;
return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
}
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字符串反转
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第一种:
- (NSString *)reverseWordsInString:(NSString *)str
{
NSMutableString *newString = [[NSMutableString alloc] initWithCapacity:str.length];
for (NSInteger i = str.length - 1; i >= 0 ; i --)
{
unichar ch = [str characterAtIndex:i];
[newString appendFormat:@ "%c" , ch];
}
return newString;
}
//第二种:
- (NSString*)reverseWordsInString:(NSString*)str
{
NSMutableString *reverString = [NSMutableString stringWithCapacity:str.length];
[str enumerateSubstringsInRange:NSMakeRange(0, str.length) options:NSStringEnumerationReverse | NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
[reverString appendString:substring];
}];
return reverString;
}
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禁止锁屏
默认情况下,当设备一段时间没有触控动作时,iOS会锁住屏幕。但有一些应用是不需要锁屏的,比如视频播放器。
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[UIApplication sharedApplication].idleTimerDisabled = YES;
或
[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
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模态推出透明界面
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UIViewController *vc = [[UIViewController alloc] init];
UINavigationController *na = [[UINavigationController alloc] initWithRootViewController:vc];
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
{
na.modalPresentationStyle = UIModalPresentationOverCurrentContext;
}
else
{
self.modalPresentationStyle=UIModalPresentationCurrentContext;
}
[self presentViewController:na animated:YES completion:nil];
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Xcode调试不显示内存占用
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editSCheme 里面有个选项叫叫做enable zoombie Objects 取消选中
显示隐藏文件
//显示
defaults write com.apple.finder AppleShowAllFiles -bool true
killall Finder
//隐藏
defaults write com.apple.finder AppleShowAllFiles -bool false
killall Finder
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字符串按多个符号分割
iOS跳转到App Store下载应用评分
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[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@ "itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=APPID" ]];
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iOS 获取汉字的拼音
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+ (NSString *)transform:(NSString *)chinese
{
//将NSString装换成NSMutableString
NSMutableString *pinyin = [chinese mutableCopy];
//将汉字转换为拼音(带音标)
CFStringTransform((__bridge CFMutableStringRef)pinyin, NULL, kCFStringTransformMandarinLatin, NO);
NSLog(@ "%@" , pinyin);
//去掉拼音的音标
CFStringTransform((__bridge CFMutableStringRef)pinyin, NULL, kCFStringTransformStripCombiningMarks, NO);
NSLog(@ "%@" , pinyin);
//返回最近结果
return pinyin;
}
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手动更改iOS状态栏的颜色
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- (void)setStatusBarBackgroundColor:(UIColor *)color
{
UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@ "statusBarWindow" ] valueForKey:@ "statusBar" ];
if ([statusBar respondsToSelector:@selector(setBackgroundColor:)])
{
statusBar.backgroundColor = color;
}
}
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判断当前ViewController是push还是present的方式显示的
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NSArray *viewcontrollers=self.navigationController.viewControllers;
if (viewcontrollers.count > 1)
{
if ([viewcontrollers objectAtIndex:viewcontrollers.count - 1] == self)
{
//push方式
[self.navigationController popViewControllerAnimated:YES];
}
}
else
{
//present方式
[self dismissViewControllerAnimated:YES completion:nil];
}
获取实际使用的LaunchImage图片
- (NSString *)getLaunchImageName
{
CGSize viewSize = self.window.bounds.size;
// 竖屏
NSString *viewOrientation = @ "Portrait" ;
NSString *launchImageName = nil;
NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@ "UILaunchImages" ];
for (NSDictionary* dict in imagesDict)
{
CGSize imageSize = CGSizeFromString(dict[@ "UILaunchImageSize" ]);
if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@ "UILaunchImageOrientation" ]])
{
launchImageName = dict[@ "UILaunchImageName" ];
}
}
return launchImageName;
}
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iOS在当前屏幕获取第一响应
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UIWindow * keyWindow = [[UIApplication sharedApplication] keyWindow];
UIView * firstResponder = [keyWindow performSelector:@selector(firstResponder)];
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判断对象是否遵循了某协议
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if ([self.selectedController conformsToProtocol:@protocol(RefreshPtotocol)])
{
[self.selectedController performSelector:@selector(onTriggerRefresh)];
}
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判断view是不是指定视图的子视图
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BOOL isView = [textView isDescendantOfView:self.view];
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NSArray 快速求总和 最大值 最小值 和 平均值
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NSArray *array = [NSArray arrayWithObjects:@ "2.0" , @ "2.3" , @ "3.0" , @ "4.0" , @ "10" , nil];
CGFloat sum = [[array valueForKeyPath:@ "@sum.floatValue" ] floatValue];
CGFloat avg = [[array valueForKeyPath:@ "@avg.floatValue" ] floatValue];
CGFloat max =[[array valueForKeyPath:@ "@max.floatValue" ] floatValue];
CGFloat min =[[array valueForKeyPath:@ "@min.floatValue" ] floatValue];
NSLog(@ "%f\n%f\n%f\n%f" ,sum,avg,max,min);
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修改UITextField中Placeholder的文字颜色
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[textField setValue:[UIColor redColor] forKeyPath:@ "_placeholderLabel.textColor" ];
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关于NSDateFormatter的格式
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G: 公元时代,例如AD公元
yy: 年的后2位
yyyy: 完整年
MM: 月,显示为1-12
MMM: 月,显示为英文月份简写,如 Jan
MMMM: 月,显示为英文月份全称,如 Janualy
dd: 日,2位数表示,如02
d: 日,1-2位显示,如 2
EEE: 简写星期几,如Sun
EEEE: 全写星期几,如Sunday
aa: 上下午,AM/PM
H: 时,24小时制,0-23
K:时,12小时制,0-11
m: 分,1-2位
mm: 分,2位
s: 秒,1-2位
ss: 秒,2位
S: 毫秒
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获取一个类的所有子类
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+ (NSArray *) allSubclasses
{
Class myClass = [self class];
NSMutableArray *mySubclasses = [NSMutableArray array];
unsigned int numOfClasses;
Class *classes = objc_copyClassList(&numOfClasses;);
for (unsigned int ci = 0; ci ( numOfClasses; ci++)
{
Class superClass = classes[ci];
do {
superClass = class_getSuperclass(superClass);
} while (superClass && superClass != myClass);
if (superClass)
{
[mySubclasses addObject: classes[ci]];
}
}
free(classes);
return mySubclasses;
}
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监测IOS设备是否设置了代理,需要CFNetwork.framework
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NSDictionary *proxySettings = (__bridge NSDictionary *)(CFNetworkCopySystemProxySettings());
NSArray *proxies = (__bridge NSArray *)(CFNetworkCopyProxiesForURL((__bridge CFURLRef _Nonnull)([NSURL URLWithString:@ "http://www.baidu.com" ]), (__bridge CFDictionaryRef _Nonnull)(proxySettings)));
NSLog(@ "\n%@" ,proxies);
NSDictionary *settings = proxies[0];
NSLog(@ "%@" ,[settings objectForKey:(NSString *)kCFProxyHostNameKey]);
NSLog(@ "%@" ,[settings objectForKey:(NSString *)kCFProxyPortNumberKey]);
NSLog(@ "%@" ,[settings objectForKey:(NSString *)kCFProxyTypeKey]);
if ([[settings objectForKey:(NSString *)kCFProxyTypeKey] isEqualToString:@ "kCFProxyTypeNone" ])
{
NSLog(@ "没代理" );
}
else
{
NSLog(@ "设置了代理" );
}
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阿拉伯数字转中文格式
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+(NSString *)translation:(NSString *)arebic
{
NSString *str = arebic;
NSArray *arabic_numerals = @[@ "1" ,@ "2" ,@ "3" ,@ "4" ,@ "5" ,@ "6" ,@ "7" ,@ "8" ,@ "9" ,@ "0" ];
NSArray *chinese_numerals = @[@ "一" ,@ "二" ,@ "三" ,@ "四" ,@ "五" ,@ "六" ,@ "七" ,@ "八" ,@ "九" ,@ "零" ];
NSArray *digits = @[@ "个" ,@ "十" ,@ "百" ,@ "千" ,@ "万" ,@ "十" ,@ "百" ,@ "千" ,@ "亿" ,@ "十" ,@ "百" ,@ "千" ,@ "兆" ];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:chinese_numerals forKeys:arabic_numerals];
NSMutableArray *sums = [NSMutableArray array];
for (int i = 0; i ( str.length; i ++) {
NSString *substr = [str substringWithRange:NSMakeRange(i, 1)];
NSString *a = [dictionary objectForKey:substr];
NSString *b = digits[str.length -i-1];
NSString *sum = [a stringByAppendingString:b];
if ([a isEqualToString:chinese_numerals[9]])
{
if ([b isEqualToString:digits[4]] || [b isEqualToString:digits[8]])
{
sum = b;
if ([[sums lastObject] isEqualToString:chinese_numerals[9]])
{
[sums removeLastObject];
}
} else
{
sum = chinese_numerals[9];
}
if ([[sums lastObject] isEqualToString:sum])
{
continue ;
}
}
[sums addObject:sum];
}
NSString *sumStr = [sums componentsJoinedByString:@ "" ];
NSString *chinese = [sumStr substringToIndex:sumStr.length-1];
NSLog(@ "%@" ,str);
NSLog(@ "%@" ,chinese);
return chinese;
}
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Base64编码与NSString对象或NSData对象的转换
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// Create NSData object
NSData *nsdata = [@ "iOS Developer Tips encoded in Base64"
dataUsingEncoding:NSUTF8StringEncoding];
// Get NSString from NSData object in Base64
NSString *base64Encoded = [nsdata base64EncodedStringWithOptions:0];
// Print the Base64 encoded string
NSLog(@ "Encoded: %@" , base64Encoded);
// Let's go the other way...
// NSData from the Base64 encoded str
NSData *nsdataFromBase64String = [[NSData alloc]
initWithBase64EncodedString:base64Encoded options:0];
// Decoded NSString from the NSData
NSString *base64Decoded = [[NSString alloc]
initWithData:nsdataFromBase64String encoding:NSUTF8StringEncoding];
NSLog(@ "Decoded: %@" , base64Decoded);
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取消UICollectionView的隐式动画
UICollectionView在reloadItems的时候,默认会附加一个隐式的fade动画,有时候很讨厌,尤其是当你的cell是复合cell的情况下(比如cell使用到了UIStackView)。
下面几种方法都可以帮你去除这些动画
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//方法一
[UIView performWithoutAnimation:^{
[collectionView reloadItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:index inSection:0]]];
}];
//方法二
[UIView animateWithDuration:0 animations:^{
[collectionView performBatchUpdates:^{
[collectionView reloadItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:index inSection:0]]];
} completion:nil];
}];
//方法三
[UIView setAnimationsEnabled:NO];
[self.trackPanel performBatchUpdates:^{
[collectionView reloadItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:index inSection:0]]];
} completion:^(BOOL finished) {
[UIView setAnimationsEnabled:YES];
}];
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让Xcode的控制台支持LLDB类型的打印
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打开终端输入三条命令:
touch ~/.lldbinit
echo display @import UIKit >> ~/.lldbinit
echo target stop-hook add -o \"target stop-hook disable\" >> ~/.lldbinit
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CocoaPods pod install/pod update更新慢的问题
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pod install --verbose --no-repo-update
pod update --verbose --no-repo-update
如果不加后面的参数,默认会升级CocoaPods的spec仓库,加一个参数可以省略这一步,然后速度就会提升不少
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UIImage 占用内存大小
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UIImage *image = [UIImage imageNamed:@ "aa" ];
NSUInteger size = CGImageGetHeight(image.CGImage) * CGImageGetBytesPerRow(image.CGImage);
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GCD timer定时器
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dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue);
dispatch_source_set_timer(timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行
dispatch_source_set_event_handler(timer, ^{
//@"倒计时结束,关闭"
dispatch_source_cancel(timer);
dispatch_async(dispatch_get_main_queue(), ^{
});
});
dispatch_resume(timer);
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图片上绘制文字 写一个UIImage的category
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- (UIImage *)imageWithTitle:(NSString *)title fontSize:(CGFloat)fontSize
{
//画布大小
CGSize size=CGSizeMake(self.size.width,self.size.height);
//创建一个基于位图的上下文
UIGraphicsBeginImageContextWithOptions(size,NO,0.0); //opaque:NO scale:0.0
[self drawAtPoint:CGPointMake(0.0,0.0)];
//文字居中显示在画布上
NSMutableParagraphStyle* paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
paragraphStyle.alignment=NSTextAlignmentCenter; //文字居中
//计算文字所占的size,文字居中显示在画布上
CGSize sizeText=[title boundingRectWithSize:self.size options:NSStringDrawingUsesLineFragmentOrigin
attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:fontSize]}context:nil].size;
CGFloat width = self.size.width;
CGFloat height = self.size.height;
CGRect rect = CGRectMake((width-sizeText.width)/2, (height-sizeText.height)/2, sizeText.width, sizeText.height);
//绘制文字
[title drawInRect:rect withAttributes:@{ NSFontAttributeName:[UIFont systemFontOfSize:fontSize],NSForegroundColorAttributeName:[ UIColor whiteColor],NSParagraphStyleAttributeName:paragraphStyle}];
//返回绘制的新图形
UIImage *newImage= UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
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查找一个视图的所有子视图
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- (NSMutableArray *)allSubViewsForView:(UIView *)view
{
NSMutableArray *array = [NSMutableArray arrayWithCapacity:0];
for (UIView *subView in view.subviews)
{
[array addObject:subView];
if (subView.subviews.count > 0)
{
[array addObjectsFromArray:[self allSubViewsForView:subView]];
}
}
return array;
}
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计算文件大小
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//文件大小
- (long long)fileSizeAtPath:(NSString *)path
{
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:path])
{
long long size = [fileManager attributesOfItemAtPath:path error:nil].fileSize;
return size;
}
return 0;
}
//文件夹大小
- (long long)folderSizeAtPath:(NSString *)path
{
NSFileManager *fileManager = [NSFileManager defaultManager];
long long folderSize = 0;
if ([fileManager fileExistsAtPath:path])
{
NSArray *childerFiles = [fileManager subpathsAtPath:path];
for (NSString *fileName in childerFiles)
{
NSString *fileAbsolutePath = [path stringByAppendingPathComponent:fileName];
if ([fileManager fileExistsAtPath:fileAbsolutePath])
{
long long size = [fileManager attributesOfItemAtPath:fileAbsolutePath error:nil].fileSize;
folderSize += size;
}
}
}
return folderSize;
}
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