1. 打印View所有子視圖
[[self view]recursiveDescription]
2. NSString過濾特殊字符
// 定義一個(gè)特殊字符的集合
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:
@"@/:;()¥「」"搀罢、[]{}#%-*+=_\\|~<>$€^?'@#$%^&*()_+'\""];
// 過濾字符串的特殊字符
NSString *newString = [trimString stringByTrimmingCharactersInSet:set];
3. TransForm屬性
//平移按鈕
CGAffineTransform transForm = self.buttonView.transform;
self.buttonView.transform = CGAffineTransformTranslate(transForm, 10, 0);
//旋轉(zhuǎn)按鈕
CGAffineTransform transForm = self.buttonView.transform;
self.buttonView.transform = CGAffineTransformRotate(transForm, M_PI_4);
//縮放按鈕
self.buttonView.transform = CGAffineTransformScale(transForm, 1.2, 1.2);
//初始化復(fù)位
self.buttonView.transform = CGAffineTransformIdentity;
4. 去掉分割線多余15像素
首先在viewDidLoad方法加入以下代碼:
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {
[self.tableView setSeparatorInset:UIEdgeInsetsZero];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {
[self.tableView setLayoutMargins:UIEdgeInsetsZero];
}
然后在重寫willDisplayCell方法
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath{
if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
[cell setSeparatorInset:UIEdgeInsetsZero];
}
if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}
5. 計(jì)算方法耗時(shí)時(shí)間間隔
// 獲取時(shí)間間隔
#define TICK CFAbsoluteTime start = CFAbsoluteTimeGetCurrent();
#define TOCK NSLog(@"Time: %f", CFAbsoluteTimeGetCurrent() - start)
6. Color顏色宏定義
// 隨機(jī)顏色
#define RANDOM_COLOR [UIColor colorWithRed:arc4random_uniform(256) / 255.0 green:arc4random_uniform(256) / 255.0 blue:arc4random_uniform(256) / 255.0 alpha:1]
// 顏色(RGB)
#define RGBCOLOR(r, g, b) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:1]
// 利用這種方法設(shè)置顏色和透明值蝗岖,可不影響子視圖背景色
#define RGBACOLOR(r, g, b, a) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a)]
7. Alert提示宏定義
#define Alert(_S_, ...) [[[UIAlertView alloc] initWithTitle:@"提示" message:[NSString stringWithFormat:(_S_), ##__VA_ARGS__] delegate:nil cancelButtonTitle:@"確定" otherButtonTitles:nil] show]
8. 讓iOS應(yīng)用直接退出
- (void)exitApplication {
AppDelegate *app = [UIApplication sharedApplication].delegate;
UIWindow *window = app.window;
[UIView animateWithDuration:1.0f animations:^{
window.alpha = 0;
} completion:^(BOOL finished) {
exit(0);
}];
}
9. NSArray 快速求總和 最大值 最小值 和 平均值
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);
10. 修改Label中不同文字顏色
- (void)touchesEnded:(NSSet<UITouch> *)touches withEvent:(UIEvent *)event
{
[self editStringColor:self.label.text editStr:@"好" color:[UIColor blueColor]];
}
- (void)editStringColor:(NSString *)string editStr:(NSString *)editStr color:(UIColor *)color {
// string為整體字符串, editStr為需要修改的字符串
NSRange range = [string rangeOfString:editStr];
NSMutableAttributedString *attribute = [[NSMutableAttributedString alloc] initWithString:string];
// 設(shè)置屬性修改字體顏色UIColor與大小UIFont
[attribute addAttributes:@{NSForegroundColorAttributeName:color} range:range];
self.label.attributedText = attribute;
}
11. 播放聲音
#import<AVFoundation>
// 1.獲取音效資源的路徑
NSString *path = [[NSBundle mainBundle]pathForResource:@"pour_milk" ofType:@"wav"];
// 2.將路勁轉(zhuǎn)化為url
NSURL *tempUrl = [NSURL fileURLWithPath:path];
// 3.用轉(zhuǎn)化成的url創(chuàng)建一個(gè)播放器
NSError *error = nil;
AVAudioPlayer *play = [[AVAudioPlayer alloc]initWithContentsOfURL:tempUrl error:&error];
self.player = play;
// 4.播放
[play play];
12. 檢測(cè)是否IPad Pro
- (BOOL)isIpadPro
{
UIScreen *Screen = [UIScreen mainScreen];
CGFloat width = Screen.nativeBounds.size.width/Screen.nativeScale;
CGFloat height = Screen.nativeBounds.size.height/Screen.nativeScale;
BOOL isIpad =[[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad;
BOOL hasIPadProWidth = fabs(width - 1024.f) < DBL xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed>> ~/.lldbinit
echo target stop-hook add -o \"target stop-hook disable\" >> ~/.lldbinit
下次重新運(yùn)行項(xiàng)目,然后就不報(bào)錯(cuò)了榔至。
13. Label行間距
-(void)test{
NSMutableAttributedString *attributedString =
[[NSMutableAttributedString alloc] initWithString:self.contentLabel.text];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:3];
//調(diào)整行間距
[attributedString addAttribute:NSParagraphStyleAttributeName
value:paragraphStyle
range:NSMakeRange(0, [self.contentLabel.text length])];
self.contentLabel.attributedText = attributedString;
}
14. UIImageView填充模式
@"UIViewContentModeScaleToFill", // 拉伸自適應(yīng)填滿整個(gè)視圖
@"UIViewContentModeScaleAspectFit", // 自適應(yīng)比例大小顯示
@"UIViewContentModeScaleAspectFill", // 原始大小顯示
@"UIViewContentModeRedraw", // 尺寸改變時(shí)重繪
@"UIViewContentModeCenter", // 中間
@"UIViewContentModeTop", // 頂部
@"UIViewContentModeBottom", // 底部
@"UIViewContentModeLeft", // 中間貼左
@"UIViewContentModeRight", // 中間貼右
@"UIViewContentModeTopLeft", // 貼左上
@"UIViewContentModeTopRight", // 貼右上
@"UIViewContentModeBottomLeft", // 貼左下
@"UIViewContentModeBottomRight", // 貼右下
15. 宏定義檢測(cè)block是否可用
#define BLOCK_EXEC(block, ...) if (block) { block(__VA_ARGS__); };
// 宏定義之前的用法
if (completionBlock) {
completionBlock(arg1, arg2);
}
// 宏定義之后的用法
BLOCK_EXEC(completionBlock, arg1, arg2);
16. Debug欄打印時(shí)自動(dòng)把Unicode編碼轉(zhuǎn)化成漢字
// 有時(shí)候我們?cè)趚code中打印中文,會(huì)打印出Unicode編碼,還需要自己去一些在線網(wǎng)站轉(zhuǎn)換,有了插件就方便多了抵赢。
DXXcodeConsoleUnicodePlugin 插件
17. 設(shè)置狀態(tài)欄文字樣式顏色
[[UIApplication sharedApplication] setStatusBarHidden:NO];
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
18. 自動(dòng)生成模型代碼的插件
// 可自動(dòng)生成模型的代碼,省去寫模型代碼的時(shí)間
ESJsonFormat-for-Xcode
19. iOS中的一些手勢(shì)
輕擊手勢(shì)(TapGestureRecognizer)
輕掃手勢(shì)(SwipeGestureRecognizer)
長(zhǎng)按手勢(shì)(LongPressGestureRecognizer)
拖動(dòng)手勢(shì)(PanGestureRecognizer)
捏合手勢(shì)(PinchGestureRecognizer)
旋轉(zhuǎn)手勢(shì)(RotationGestureRecognizer)
20. iOS 開發(fā)中一些相關(guān)的路徑
模擬器的位置:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs
文檔安裝位置:
/Applications/Xcode.app/Contents/Developer/Documentation/DocSets
插件保存路徑:
~/Library/ApplicationSupport/Developer/Shared/Xcode/Plug-ins
自定義代碼段的保存路徑:
~/Library/Developer/Xcode/UserData/CodeSnippets/
如果找不到CodeSnippets文件夾唧取,可以自己新建一個(gè)CodeSnippets文件夾铅鲤。
證書路徑
~/Library/MobileDevice/Provisioning Profiles
21. 獲取 iOS 路徑的方法
獲取家目錄路徑的函數(shù)
NSString *homeDir = NSHomeDirectory();
獲取Documents目錄路徑的方法
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [paths objectAtIndex:0];
獲取Documents目錄路徑的方法
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachesDir = [paths objectAtIndex:0];
獲取tmp目錄路徑的方法:
NSString *tmpDir = NSTemporaryDirectory();
22. 字符串相關(guān)操作
去除所有的空格
[str stringByReplacingOccurrencesOfString:@" " withString:@""]
去除首尾的空格
[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
- (NSString *)uppercaseString; 全部字符轉(zhuǎn)為大寫字母
- (NSString *)lowercaseString 全部字符轉(zhuǎn)為小寫字母
23. 把tableview里cell的小對(duì)勾的顏色改成別的顏色
_mTableView.tintColor = [UIColor redColor];
24. 調(diào)整tableview的separaLine線的位置
tableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0);
25. 設(shè)置滑動(dòng)的時(shí)候隱藏navigationbar
navigationController.hidesBarsOnSwipe = Yes
26. Quartz2D相關(guān)
圖形上下是一個(gè)CGContextRef類型的數(shù)據(jù)。
圖形上下文包含:
1兵怯,繪圖路徑(各種各樣圖形)
2彩匕,繪圖狀態(tài)(顏色,線寬媒区,樣式驼仪,旋轉(zhuǎn)掸犬,縮放,平移)
3绪爸,輸出目標(biāo)(繪制到什么地方去湾碎?UIView、圖片)
1奠货,獲取當(dāng)前圖形上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
2介褥,添加線條
CGContextMoveToPoint(ctx, 20, 20);
3,渲染
CGContextStrokePath(ctx);
CGContextFillPath(ctx);
4递惋,關(guān)閉路徑
CGContextClosePath(ctx);
5柔滔,畫矩形
CGContextAddRect(ctx, CGRectMake(20, 20, 100, 120));
6,設(shè)置線條顏色
[[UIColor redColor] setStroke];
7萍虽, 設(shè)置線條寬度
CGContextSetLineWidth(ctx, 20);
8睛廊,設(shè)置頭尾樣式
CGContextSetLineCap(ctx, kCGLineCapSquare);
9,設(shè)置轉(zhuǎn)折點(diǎn)樣式
CGContextSetLineJoin(ctx, kCGLineJoinBevel);
10杉编,畫圓
CGContextAddEllipseInRect(ctx, CGRectMake(30, 50, 100, 100));
11超全,指定圓心
CGContextAddArc(ctx, 100, 100, 50, 0, M_PI * 2, 1);
12,獲取圖片上下文
UIGraphicsGetImageFromCurrentImageContext();
13邓馒,保存圖形上下文
CGContextSaveGState(ctx)
14嘶朱,恢復(fù)圖形上下文
CGContextRestoreGState(ctx)
27. 屏幕截圖
// 1. 開啟一個(gè)與圖片相關(guān)的圖形上下文
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size,NO,0.0);
// 2. 獲取當(dāng)前圖形上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
// 3. 獲取需要截取的view的layer
[self.view.layer renderInContext:ctx];
// 4. 從當(dāng)前上下文中獲取圖片
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
// 5. 關(guān)閉圖形上下文
UIGraphicsEndImageContext();
// 6. 把圖片保存到相冊(cè)
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
28. 隱藏導(dǎo)航欄上的返回字體
//Swift
UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -60), forBarMetrics: .Default)
//OC
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault];
29. 解決tableview的分割線短一截
-(void)viewDidLayoutSubviews{
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)])
{
[self.tableView setSeparatorInset:UIEdgeInsetsMake(0,0,0,0)];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)])
{
[self.tableView setLayoutMargins:UIEdgeInsetsMake(0,0,0,0)];
}
}
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
if ([cell respondsToSelector:@selector(setSeparatorInset:)])
{
[cell setSeparatorInset:UIEdgeInsetsZero];
}
if ([cell respondsToSelector:@selector(setLayoutMargins:)])
{
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}
30. 動(dòng)態(tài)隱藏NavigationBar
//1.當(dāng)我們的手離開屏幕時(shí)候隱藏
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
if(velocity.y > 0)
{
[self.navigationController setNavigationBarHidden:YES animated:YES];
} else {
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
}
velocity.y這個(gè)量,在上滑和下滑時(shí)光酣,變化極惺瓒簟(小數(shù)),但是因?yàn)榉较虿煌医姓?fù)之分改览,這就很好處理了下翎。
//2.在滑動(dòng)過程中隱藏
//像safari
(1)
self.navigationController.hidesBarsOnSwipe = YES;
(2)
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat offsetY = scrollView.contentOffset.y + __tableView.contentInset.top;
CGFloat panTranslationY = [scrollView.panGestureRecognizer translationInView:self.tableView].y;
if (offsetY > 64) {
if (panTranslationY > 0)
{
//下滑趨勢(shì)缤言,顯示
[self.navigationController setNavigationBarHidden:NO animated:YES];
} else {
//上滑趨勢(shì),隱藏
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
} else {
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
}
這里的offsetY > 64只是為了在視圖滑過navigationBar的高度之后才開始處理视事,防止影響展示效果胆萧。panTranslationY是scrollView的pan手勢(shì)的手指位置的y值,可能不是太好俐东,因?yàn)閜anTranslationY這個(gè)值在較小幅度上下滑動(dòng)時(shí)切心,可能都為正或都為負(fù)垂券,這就使得這一方式不太靈敏.
31. 設(shè)置導(dǎo)航欄透明
//方法一:設(shè)置透明度
[[[self.navigationController.navigationBar subviews]objectAtIndex:0] setAlpha:0.1];
//方法二:設(shè)置背景圖片
/**
* 設(shè)置導(dǎo)航欄,使其透明
*
*/
- (void)setNavigationBarColor:(UIColor *)color targetController:(UIViewController *)targetViewController{
//導(dǎo)航條的顏色 以及隱藏導(dǎo)航條的顏色targetViewController.navigationController.navigationBar.shadowImage = [[UIImage alloc]init];
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(); [targetViewController.navigationController.navigationBar setBackgroundImage:theImage forBarMetrics:UIBarMetricsDefault];
}
32. 設(shè)置字體和行間距
//設(shè)置字體和行間距
UILabel * lable = [[UILabel alloc]initWithFrame:CGRectMake(50, 100, 300, 200)];
lable.text = @"大家好,我是Frank_chun,在這里我們一起學(xué)習(xí)新的知識(shí),總結(jié)我們遇到的那些坑,共同的學(xué)習(xí),共同的進(jìn)步,共同的努力,只為美好的明天!!!有問題一起相互的探討--438637472!!!";
lable.numberOfLines = 0;
lable.font = [UIFont systemFontOfSize:12];
lable.backgroundColor = [UIColor grayColor];
[self.view addSubview:lable];
//設(shè)置每個(gè)字體之間的間距
//NSKernAttributeName 這個(gè)對(duì)象所對(duì)應(yīng)的值是一個(gè)NSNumber對(duì)象(包含小數(shù)),作用是修改默認(rèn)字體之間的距離調(diào)整,值為0的話表示字距調(diào)整是禁用的; NSMutableAttributedString * str = [[NSMutableAttributedString alloc]initWithString:lable.text attributes:@{NSKernAttributeName:@(5.0)}];
//設(shè)置某寫字體的顏色
//NSForegroundColorAttributeName 設(shè)置字體顏色
NSRange blueRange = NSMakeRange([[str string] rangeOfString:@"Frank_chun"].location, [[str string] rangeOfString:@"Frank_chun"].length);
[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:blueRange];
NSRange blueRange1 = NSMakeRange([[str string] rangeOfString:@"438637472"].location, [[str string] rangeOfString:@"438637472"].length);
[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:blueRange1];
//設(shè)置每行之間的間距
//NSParagraphStyleAttributeName 設(shè)置段落的樣式
NSMutableParagraphStyle * par = [[NSMutableParagraphStyle alloc]init];
[par setLineSpacing:20];
//為某一范圍內(nèi)文字添加某個(gè)屬性
//NSMakeRange表示所要的范圍,從0到整個(gè)文本的長(zhǎng)度
[str addAttribute:NSParagraphStyleAttributeName value:par range:NSMakeRange(0, lable.text.length)]; [lable setAttributedText:str];
33. 點(diǎn)擊button倒計(jì)時(shí)
#pragma mark -點(diǎn)擊發(fā)送驗(yàn)證碼
- (void)sendMessage:(UIButton *)btn{
if (self.phoneField.text.length == 0) {
[self remindMessage:@"請(qǐng)輸入正確的手機(jī)號(hào)"];
}else{
__block int timeout=60;
//倒計(jì)時(shí)時(shí)間
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);
//每秒執(zhí)行
dispatch_source_set_event_handler(_timer, ^{
if(timeout<=0){
//倒計(jì)時(shí)結(jié)束,關(guān)閉
dispatch_source_cancel(_timer); dispatch_async(dispatch_get_main_queue(), ^{
// 設(shè)置界面的按鈕顯示 根據(jù)自己需求設(shè)置
[btn setTitle:@"發(fā)送驗(yàn)證碼" forState:UIControlStateNormal]; btn.userInteractionEnabled = YES;
});
}else{
int seconds = timeout % 60;
NSString *strTime = [NSString stringWithFormat:@"%d", seconds];
if ([strTime isEqualToString:@"0"]) {
strTime = [NSString stringWithFormat:@"%d",60];
}
dispatch_async(dispatch_get_main_queue(), ^{
//設(shè)置界面的按鈕顯示 根據(jù)自己需求設(shè)置
//NSLog(@"____%@",strTime);
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[btn setTitle:[NSString stringWithFormat:@"%@秒后重新發(fā)送",strTime] forState:UIControlStateNormal];
[UIView commitAnimations];
btn.userInteractionEnabled = NO;
});
timeout--;
}
});
dispatch_resume(_timer);
}
34. UITextField默認(rèn)占位符是居中顯示,讓其居上顯示
textField.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
35. 解決同時(shí)按兩個(gè)按鈕進(jìn)兩個(gè)view的問題
[button setExclusiveTouch:YES];
36. 圖片拉伸
UIImage* img=[UIImage imageNamed:@"2.png"];//原圖
UIEdgeInsets edge=UIEdgeInsetsMake(0, 10, 0,10);
//UIImageResizingModeStretch:拉伸模式,通過拉伸UIEdgeInsets指定的矩形區(qū)域來填充圖片
//UIImageResizingModeTile:平鋪模式弦蹂,通過重復(fù)顯示UIEdgeInsets指定的矩形區(qū)域來填充圖
img= [img resizableImageWithCapInsets:edge resizingMode:UIImageResizingModeStretch];
self.imageView.image=img;
37. 修改textFieldplaceholder字體顏色和大小
textField.placeholder = @"請(qǐng)輸入手機(jī)號(hào)碼";
[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
[textField setValue:[UIFont boldSystemFontOfSize:13] forKeyPath:@"_placeholderLabel.font"];
38. 修改狀態(tài)欄字體顏色
只能設(shè)置兩種顏色,黑色和白色封拧,系統(tǒng)默認(rèn)黑色
設(shè)置為白色方法:
(1)在plist里面添加Status bar style复唤,值為UIStatusBarStyleLightContent(白色)或UIStatusBarStyleDefault(黑 色)
(2)在Info.plist中設(shè)置UIViewControllerBasedStatusBarAppearance 為NO
39. 去掉導(dǎo)航欄下邊的黑線
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];
40. 修改pagecontrol顏色
_pageControl.currentPageIndicatorTintColor=SFQRedColor;
_pageControl.pageIndicatorTintColor=SFQGrayColor;
41. 去掉UITableView的section的粘性奕枢,使其不會(huì)懸停
//有時(shí)候使用UITableView所實(shí)現(xiàn)的列表,會(huì)使用到section佩微,但是又不希望它粘在最頂上而是跟隨滾動(dòng)而消失或者出現(xiàn)
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (scrollView == _tableView) {
CGFloat sectionHeaderHeight = 36;
if (scrollView.contentOffset.y <= sectionHeaderHeight && 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);
}
}
}
42. 通過2D仿射函數(shù)實(shí)現(xiàn)小的動(dòng)畫效果(變大縮小) --可用于自定義pageControl中
[UIView animateWithDuration:0.3 animations:^{
imageView.transform = CGAffineTransformMakeScale(2, 2);
} completion:^(BOOL finished) {
imageView.transform = CGAffineTransformMakeScale(1.0, 1.0);
}];
43. UIImage與字符串互轉(zhuǎn)
//圖片轉(zhuǎn)字符串
-(NSString *)UIImageToBase64Str:(UIImage *) image
{
NSData *data = UIImageJPEGRepresentation(image, 1.0f);
NSString *encodedImageStr = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
return encodedImageStr;
}
//字符串轉(zhuǎn)圖片
-(UIImage *)Base64StrToUIImage:(NSString *)_encodedImageStr
{
NSData *_decodedImageData = [[NSData alloc] initWithBase64Encoding:_encodedImageStr];
UIImage *_decodedImage = [UIImage imageWithData:_decodedImageData];
return _decodedImage;
}
44. 判斷NSString中是否包含中文
-(BOOL)isChinese:(NSString *)str{
NSString *match=@"(^[\u4e00-\u9fa5]+$)";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF matches %@", match];
return [predicate evaluateWithObject:str];
}
45. NSDate與NSString的相互轉(zhuǎn)化
-(NSString *)dateToString:(NSDate *)date {
// 初始化時(shí)間格式控制器
NSDateFormatter *matter = [[NSDateFormatter alloc] init];
// 設(shè)置設(shè)計(jì)格式
[matter setDateFormat:@"yyyy-MM-dd hh:mm:ss zzz"];
// 進(jìn)行轉(zhuǎn)換
NSString *dateStr = [matter stringFromDate:date];
return dateStr;
}
-(NSDate *)stringToDate:(NSString *)dateStr {
// 初始化時(shí)間格式控制器
NSDateFormatter *matter = [[NSDateFormatter alloc] init];
// 設(shè)置設(shè)計(jì)格式
[matter setDateFormat:@"yyyy-MM-dd hh:mm:ss zzz"];
// 進(jìn)行轉(zhuǎn)換
NSDate *date = [matter dateFromString:dateStr];
return date;
}
46. UITextField 小技巧
//設(shè)置UITextField的placeholder的顏色
[_phoneTextField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
//設(shè)置UITextField的placeholder的字號(hào)
[_phoneTextField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];
//設(shè)置UITextField的placeholder的左邊距
_phoneTextField.leftViewMode = UITextFieldViewModeAlways;
_phoneTextField.leftView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 8, 0)];