1.產(chǎn)生隨機(jī)數(shù)
int allTextIndex = arc4random_uniform(30)+1;
2.禁止視圖自動(dòng)布局
if ([self respondsToSelector:@selector(setAutomaticallyAdjustsScrollViewInsets:)]) {
self.automaticallyAdjustsScrollViewInsets = NO;
}
3.添加單擊事件
UITapGestureRecognizer *userTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickUserPhotoImage)];
[self.userPhotoImageView addGestureRecognizer:userTap];
4.延時(shí)加載方法
double delayInSeconds = 1;
dispatch_time_t delay = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(delay, dispatch_get_main_queue(), ^(void){
//執(zhí)行的方法
});
5.簡(jiǎn)單彈出框可都，可直接寫(xiě)在pch文件中
#define kTipAlert(_S_, ...) [[[UIAlertView alloc] initWithTitle:@"提示" message:[NSString stringWithFormat:(_S_), ##__VA_ARGS__] delegate:nil cancelButtonTitle:@"知道了" otherButtonTitles:nil] show]
6.通知的簡(jiǎn)單使用
//發(fā)送登錄成功的通知
[[NSNotificationCenter defaultCenter] postNotificationName:@"UserLoginSuccess" object:nil];
//監(jiān)聽(tīng)用戶登錄成功后的通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getUserDetail) name:@"UserLoginSuccess" object:nil];
//移除通知
移除單個(gè)通知:[[NSNotificationCenter defaultCenter] removeObserver:self name:@"JPUSHNOTIFICATION" object:self];
移除當(dāng)前所有通知:[[NSNotificationCenterdefaultCenter]removeObserver:self];
7.獲取當(dāng)前國(guó)家地區(qū)
NSString *systemCountryCode = [[NSLocale currentLocale] objectForKey:NSLocaleCountryCode];
8.當(dāng)有名稱(chēng)相同的代理協(xié)議方法時(shí)如何解決轻纪？
[WXApi handleOpenURL:url delegate:(id<WXApiDelegate>)self];
比如微信和QQ的代理中有個(gè)方法名稱(chēng)都叫 onResp：
微信：-(void)onResp:(BaseResp*)resp;
QQ: - (void)onResp:(QQBaseResp *)resp;
將參數(shù)改成id類(lèi)型即可
- (void)onResp:(id)resp
9.隱藏狀態(tài)欄
[[UIApplication sharedApplication]setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
10.NSTimer的簡(jiǎn)單使用
self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(refreshLessTime) userInfo:@"" repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:UITrackingRunLoopMode];
11..iOS中switch-case的優(yōu)化用法(http://www.cnblogs.com/easonoutlook/archive/2012/08/16/2642011.html)
之前使用switch-case的時(shí)候一直無(wú)法使用聲明語(yǔ)句，只能使用調(diào)用函數(shù)的語(yǔ)句，今天看到了高手使用
其實(shí)也就是加一個(gè) { } 即可峭弟。
switch (indexPath.row) {
case 0:{
//錢(qián)包
ZMWalletViewController *vc = [[ZMWalletViewController alloc] init];
[self.viewController.navigationController pushViewController:vc animated:YES];
break;
}
default:
break;
}
12.使用Masnory 獲取Frame
[self.rightButton.superview layoutIfNeeded];
CGRect frame = self.rightButton.frame;
CGRect frame2 = self.leftButton.frame;
NSLog(@"%@",NSStringFromCGRect(frame));
13.使用UIBezierPath 創(chuàng)建分割線
UIBezierPath *path = [[UIBezierPath alloc] init];
//path創(chuàng)建好后矿辽，就可以設(shè)置其線寬，顏色等屬性
[path moveToPoint:CGPointMake(0, 0)];
[path addLineToPoint:CGPointMake(UISCREENWIDTH, 0)];
path.lineCapStyle = kCGLineCapRound;
path.lineJoinStyle = kCGLineJoinRound;
CAShapeLayer *shapeLayer=[CAShapeLayer layer];
shapeLayer.path=path.CGPath;
shapeLayer.fillColor = [UIColor clearColor].CGColor;//填充顏色
shapeLayer.strokeColor = [ZMColor colorWithRed:210 withGreen:210 withBlue:212 withAlpha:0.45].CGColor;//邊框顏色
shapeLayer.lineWidth = 0.5;
[self.layer addSublayer:shapeLayer];
14.判斷含有某個(gè)字符串
//第一種方式
if ([actionSheet.title rangeOfString:@"://"].location == NSNotFound 如果為false筋蓖，表示含有://字符
//第二種方式
NSString *testStr = @"我是test";
[testStr containsString:@"test"];
15.Library not loaded: 錯(cuò)誤解決方法
在build phases 改為optional
16.Xcode調(diào)試不能停在代碼區(qū)域
只要 XCode中 Debug -> Debug Workflow - Always Shaw Disassembly 取消打勾就可以了
17.主線程更新UI
__weak typeof(self) weakSelf = self;
dispatch_async(dispatch_get_main_queue(), ^{
weakSelf.tableView.tableHeaderView = weakSelf.headView;
[weakSelf.tableView reloadData];
});
18.xcode 7.0 CAAnimationDelegate 報(bào)錯(cuò)
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 100000
@interface XWFilterTransitionView () <CAAnimationDelegate>
#else
@interface XWFilterTransitionView ()
#endif
19.判斷對(duì)象是否為空
- (BOOL)isNull
{
if ([self isEqual:[NSNull null]])
{
return YES;
}
else
{
if ([self isKindOfClass:[NSNull class]])
{
return YES;
}
else
{
if (self==nil)
{
return YES;
}
}
}
if ([self isKindOfClass:[NSString class]]) {
if ([((NSString *)self) isEqualToString:@"(null)"]) {
return YES;
}
}
return NO;
}
20.encodeWithCoder:]: unrecognized selector sent to instance 0x17462d4c0 錯(cuò)誤
歸檔解檔要遵守NSCoding 協(xié)議
21.cocoapods添加了新庫(kù)但不想更新之前的庫(kù)
pod install --no-repo-update
22.將視圖放到最下面 或最上面
[self.mainView addSubview:imageView];
[self.mainView sendSubviewToBack:imageView]; 底下
[self.mainView bringSubviewToFront :imageView]; 朝上
23.GPUImage err = CVOpenGLESTextureCacheCreateTextureFromImage (kCFAllocatorDefault, coreVideoTextureCache, renderTarget錯(cuò)誤
Product -> Scheme -> Edit Scheme -> Disabled 這只是在Debug才會(huì)報(bào)錯(cuò)荤西，不連接xcode不會(huì)報(bào)錯(cuò)澜搅。
24.IQKeyboardManager鍵盤(pán)庫(kù)的簡(jiǎn)單使用
// 獲取類(lèi)庫(kù)的單例變量
IQKeyboardManager *keyboardManager = [IQKeyboardManager sharedManager];
// 控制整個(gè)功能是否啟用
keyboardManager.enable = YES;
// 控制點(diǎn)擊背景是否收起鍵盤(pán)
keyboardManager.shouldResignOnTouchOutside = YES;
// 控制鍵盤(pán)上的工具條文字顏色是否用戶自定義
keyboardManager.shouldToolbarUsesTextFieldTintColor = YES;
// 有多個(gè)輸入框時(shí)，可以通過(guò)點(diǎn)擊Toolbar 上的“前一個(gè)”“后一個(gè)”按鈕來(lái)實(shí)現(xiàn)移動(dòng)到不同的輸入框
keyboardManager.toolbarManageBehaviour = IQAutoToolbarBySubviews;
// 控制是否顯示鍵盤(pán)上的工具條
keyboardManager.enableAutoToolbar = YES;
// 是否顯示占位文字
keyboardManager.shouldShowTextFieldPlaceholder = YES;
// 設(shè)置占位文字的字體
keyboardManager.placeholderFont = [UIFont boldSystemFontOfSize:17];
// 輸入框距離鍵盤(pán)的距離
keyboardManager.keyboardDistanceFromTextField = 10.0f;
keyboardManager.preventShowingBottomBlankSpace = NO;
25.跳轉(zhuǎn)到評(píng)價(jià)頁(yè)面
NSString *str = [NSString stringWithFormat:@"itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=你的AppId" ];
if( ([[[UIDevice currentDevice] systemVersion] doubleValue]>=7.0)){
str = [NSString stringWithFormat:@"https://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?id=你的AppId&pageNumber=0&sortOrdering=2&type=Purple+Software&mt=8"];
}
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];
26.自動(dòng)布局 autoLayout
setNeedsLayout：告知頁(yè)面需要更新邪锌，但是不會(huì)立刻開(kāi)始更新勉躺。執(zhí)行后會(huì)立刻調(diào)用layoutSubviews。
layoutIfNeeded：告知頁(yè)面布局立刻更新觅丰。所以一般都會(huì)和setNeedsLayout一起使用饵溅。如果希望立刻生成新的frame需要調(diào)用此方法，利用這點(diǎn)一般布局動(dòng)畫(huà)可以在更新布局后直接使用這個(gè)方法讓動(dòng)畫(huà)生效妇萄。
layoutSubviews：系統(tǒng)重寫(xiě)布局 setNeedsUpdateConstraints：告知需要更新約束蜕企，但是不會(huì)立刻開(kāi)始
updateConstraintsIfNeeded：告知立刻更新約束
updateConstraints：系統(tǒng)更新約束
27.UIView 使用陰影產(chǎn)生離屏渲染卡頓相關(guān)鏈接(http://blog.csdn.net/zixiweimi/article/details/39889623)
[self.view layer].shadowPath =[UIBezierPath bezierPathWithRect:self.mainView.bounds].CGPath;
28.有時(shí)候視圖莫名其妙會(huì)動(dòng)畫(huà)效果會(huì)消失咬荷，變的很生硬，在網(wǎng)上找到了一種很巧的辦法,（http://blog.csdn.net/chenyong05314/article/details/50592299?from=singlemessage&isappinstalled=0）轻掩，這個(gè)問(wèn)題困擾了我一天幸乒，希望能幫到大家
大家可以在合適的時(shí)間加入這段代碼，比如ViewWillAppear這里
[UIView setAnimationsEnabled:YES];
