iOS开发技巧-不断更新中

镇楼专用

一些开发的小技巧分享~
1、PrefixHeader导入位置写法

$(SRCROOT)/$(PROJECT_NAME)/<#文件所在文件夹名称#>/PrefixHeader.pch

2、隐藏导航栏的两种方式

//方式一 《推荐》
//在需要隐藏的viewController中遵循<UINavigationControllerDelegate>
- (void)viewDidLoad {
    [super viewDidLoad];
 // 设置导航控制器的代理为self
    self.navigationController.delegate = self;
}

#pragma mark - UINavigationControllerDelegate
// 将要显示控制器
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    // 判断要显示的控制器是否是自己
    BOOL isShowHomePage = [viewController isKindOfClass:[self class]];
    
    [self.navigationController setNavigationBarHidden:isShowHomePage animated:YES];
}

//方式二
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    [self.navigationController setNavigationBarHidden:YES animated:YES];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];

    [self.navigationController setNavigationBarHidden:NO animated:YES];
}

3、TabBarItem要求只显示图片不显示文字

 // self 表示需要设置样式的控制器
 [self.tabBarItem setImageInsets:UIEdgeInsetsMake(6, 0, -6, 0)];

4、TableView或CollectionView单选

<!--步骤一、 声明一个全局变量-->
@property (nonatomic, assign) NSInteger selectedIndex;
<!--步骤二、TableView或CollectionView点击事件的方法中保存点击的index，并刷新-->
self.selectedIndex = indexPath.row;
[collectionView reloadData];或[tableView reloadData];
<!--步骤三、在cellForItemAtIndexPath或cellForRowAtIndexPath方法中判断是否是所保存的index-->
if (self.selectedIndex == indexPath.row) {
    // 设置选中样式
} else {
    // 设置成默认样式    
}

5、怎么区分真机还是模拟器

#if TARGET_IPHONE_SIMULATOR  
    NSLog(@"run on simulator");  
#define SIMULATOR_TEST
#else  
//不定义SIMULATOR_TEST这个宏
    NSLog(@"run on device");  
#endif

6、if Debug

#ifdef DEBUG    
// do sth
#else   
// do sth
#endif

7、一键清理所有模拟器安装过的APP

// 先关闭所有模拟器 在终端中输入下面命令即可
xcrun simctl erase all

8、SDWebImage清理缓存

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    [[[SDWebImageManager sharedManager] imageCache] clearMemory];
}

9、UITableView的HeaderView下拉放大

1、View1:作为显示View
2、View2:作为tableView的tableHeaderView，并添加View1，View2的大小和View1大小相同.
3、在UIScrollViewDelegate方法中进行设计
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGFloat width = UIScreen.mainScreen.bounds.size.width;
    CGFloat viewHeight = kScreenWidth * 0.5; // View1的初始高度
    CGFloat yOffset = scrollView.contentOffset.y;
    if (yOffset < 0) {
        CGFloat totalOffset = viewHeight + ABS(yOffset);
        CGFloat f = totalOffset / viewHeight;
        self.headerView.frame = CGRectMake(- (width * f - width) / 2, yOffset, width * f, totalOffset);
    }
}

10、Masonry制作就宫格

//Objective-C ----> Masonry
/**
 多视图布局

 @param viewArray 视图数组
 @param column 列数
 @param tbSpeace 视图上下间距
 @param lrSpeace 视图左右间距
 @param topSpeace 和父视图上间距
 @param lrSuperViewSpeace 父视图左右间距
 @param superView 父视图
 @param viewHeight 视图高度
 */
- (void)wd_masLayoutSubViewsWithViewArray:(NSArray<UIView *> *)viewArray
                              columnOfRow:(NSInteger)column
                    topBottomOfItemSpeace:(CGFloat)tbSpeace
                      leftRightItemSpeace:(CGFloat)lrSpeace
                     topOfSuperViewSpeace:(CGFloat)topSpeace
                 leftRightSuperViewSpeace:(CGFloat)lrSuperViewSpeace
                          addToSubperView:(UIView *)superView
                               viewHeight:(CGFloat)viewHeight{
  
                    CGFloat viewWidth = superView.bounds.size.width;
                    CGFloat itemWidth = (viewWidth - lrSuperViewSpeace * 2 - (column - 1) * lrSpeace) / column * 1.0f;
                    CGFloat itemHeight = viewHeight;
                    UIView *last = nil;
  
                    for (int i = 0; i < viewArray.count; i++) {
                        UIView *item = viewArray[i];
                        [superView addSubview:item];

                        [item mas_makeConstraints:^(MASConstraintMaker *make) {
                            make.width.mas_equalTo(itemWidth);
                            make.height.mas_equalTo(itemHeight);
                          
                            CGFloat top = topSpeace + (i / column) * (itemHeight + tbSpeace);
                            make.top.mas_offset(top);
                            if (!last || (i % column) == 0) {
                                make.left.mas_offset(lrSuperViewSpeace);
                            }else{
                                make.left.mas_equalTo(last.mas_right).mas_offset(lrSpeace);
                            }
                        }];
                      
                        last = item;
                    }
}

11、Snapkit制作九宫格

//Swift ----> SnapKit
    
    /// 多视图布局
    ///
    /// - Parameters:
    ///   - viewArray: 视图数组
    ///   - columnOfRow: 列数
    ///   - topBottomOfItemSpeace: 视图上下间距
    ///   - leftRightItemSpeace: 视图左右间距
    ///   - topOfSuperViewSpeace: 和父视图上间距
    ///   - leftRightSuperViewSpeace: 父视图左右间距
    ///   - addToSubperView: 父视图
    ///   - viewHeight: 视图高度
    func wd_masLayoutSubViews(viewArray:Array<UIView>,
                              columnOfRow:Int,
                              topBottomOfItemSpeace:CGFloat,
                              leftRightItemSpeace:CGFloat,
                              topOfSuperViewSpeace:CGFloat,
                              leftRightSuperViewSpeace:CGFloat,
                              addToSubperView:UIView,
                              viewHeight:CGFloat) -> Void {
        
        
        let viewWidth = addToSubperView.bounds.width
        let tempW = leftRightSuperViewSpeace * 2 + CGFloat(columnOfRow - 1) * leftRightItemSpeace
        let itemWidth = (viewWidth - tempW) / CGFloat(columnOfRow)
        let itemHeight = viewHeight
        
        print(leftRightSuperViewSpeace,leftRightItemSpeace,itemWidth)
        
        var lastView:UIView?
        
        for (index) in viewArray.enumerated() {
            
            let item = viewArray[i]
            addToSubperView.addSubview(item)
            
            item.snp.makeConstraints { (make) in
                make.width.equalTo(itemWidth)
                make.height.equalTo(itemHeight)
                let top = topOfSuperViewSpeace + CGFloat(i / columnOfRow) * (itemHeight + topBottomOfItemSpeace)
                make.top.equalTo(top)
                
                if !(lastView != nil) || i%columnOfRow == 0 {
                    make.left.equalTo(leftRightSuperViewSpeace)
                } else {
                    make.left.equalTo((lastView?.snp.right)!).offset(leftRightItemSpeace)
                }
                
                lastView = item
            }
        }
    }

12、沉浸式TableView(ScrollView、CollectionView)

if (@available(iOS 11.0, *)) {
    self.tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
} else {
    self.automaticallyAdjustsScrollViewInsets = false;
}

13、通过身份证计算年龄

/** 通过身份证计算年龄 */
- (NSString *)calculationAgeWithBirthday: (NSString *)birthday {
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDate *nowDate = [NSDate date];
    NSString *birth = birthday;
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd"];
    NSDate *birthDay = [dateFormatter dateFromString:birth];
    unsigned int unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;
    NSDateComponents *date = [calendar components:unitFlags fromDate:birthDay toDate:nowDate options:0];
    if ([date year] > 0) {
        return [NSString stringWithFormat:@"%ld岁", (long)[date year]];
    } else if([date month] > 0) {
        return [NSString stringWithFormat:@"%ld月", (long)[date month]];
    }  else if([date day] > 0){
        return [NSString stringWithFormat:@"%ld天", (long)[date day]];
    } else {
        return @"0天";
    }
}

- (NSString *)ageStrFromIdentityCard:(NSString *)numberStr {
    NSString *dateSt;
    NSMutableString *dateS;
    if (numberStr.length > 15) {
        dateSt = [numberStr substringWithRange:NSMakeRange(6, 8)];
        dateS = [NSMutableString stringWithFormat:@"%@", dateSt];
        [dateS insertString:@"-" atIndex:4];
        [dateS insertString:@"-" atIndex:7];
        } else {
        // 只考虑 19开头的15位的身份证号
        dateSt = [NSString stringWithFormat:@"19%@",[numberStr substringWithRange:NSMakeRange(6, 6)]];
        dateS = [NSMutableString stringWithFormat:@"%@", dateSt];
        [dateS insertString:@"-" atIndex:4];
        [dateS insertString:@"-" atIndex:7];
    }
    return [self calculationAgeWithBirthday:dateS];
}

14、利用runtime自动归档

// 导入头文件
#import <objc/runtime.h>
// 遵循协议
<NSCoding>
// 实现方法
- (id)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super init]) {
        unsigned int outCount;
        Ivar * ivars = class_copyIvarList([self class], &outCount);
        for (int i = 0; i < outCount; i ++) {
            Ivar ivar = ivars[i];
            NSString * key = [NSString stringWithUTF8String:ivar_getName(ivar)];
            [self setValue:[aDecoder decodeObjectForKey:key] forKey:key];
        }
    }
    return self;
}

- (void)encodeWithCoder:(NSCoder *)aCoder {
    unsigned int outCount;
    Ivar * ivars = class_copyIvarList([self class], &outCount);
    for (int i = 0; i < outCount; i ++) {
        Ivar ivar = ivars[i];
        NSString * key = [NSString stringWithUTF8String:ivar_getName(ivar)];
        [aCoder encodeObject:[self valueForKey:key] forKey:key];
    }
}