IOS客户端Coding项目记录(四)

2019-11-14 19:15:56

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1:打开Xcode，然后闪退，报加载某库出现异常

如/applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/libclang.dylib这个是Xcode的bug，我的情况是打开某个项目会出现这个问题解决办法：这还是缓存问题，详见第五点（5、XCode5由于缓存问题引起了很多奇怪的问题，所以清除缓存有时会起到大作用：），清除缓存再运行，一切正常。进入步骤，按option键进入资源库，Developer—xcode—DerivedData把里面的文件清除就可以

2:加快CocoaPod安装插件的速度

（这样也解决一些插件下载时失败的问题，因为一些源代码的内容是不必要，而提供的地址却连接不到，导致报错，而无法更新）$ pod install --no-repo-update

3:userInteractionEnabled属性

当视图对象的userInteractionEnabled设置为NO的时候，用户触发的事件，如触摸，键盘等，将会被该视图忽略（其他视图照常响应），并且该视图对象也会从事件响应队列中被移除。 当userInteractionEnabled设为YES时，则事件可以正常的传递给该视图对象。 userInteractionEnabled的属性默认值就是YES。EaseUserHeaderView *headerView = [[EaseUserHeaderView alloc] init];headerView.userInteractionEnabled = YES;

4:字符串显示问题，同一行不同的效果

调用：[_fansCountBtn setAttributedTitle:[self getStringWithTitle:@"粉丝" andValue:_curUser.fans_count.stringValue] forState:UIControlStateNormal];方法：- (NSMutableAttributedString*)getStringWithTitle:(NSString *)title andValue:(NSString *)value{    NSMutableAttributedString *attriString = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@"%@ %@", value, title]];    [attriString addAttributes:@{NSFontAttributeName : [UIFont boldSystemFontOfSize:17],                                 NSForegroundColorAttributeName : [UIColor whiteColor]}                         range:NSMakeRange(0, value.length)];        [attriString addAttributes:@{NSFontAttributeName : [UIFont systemFontOfSize:14],                                 NSForegroundColorAttributeName : [UIColor whiteColor]}                         range:NSMakeRange(value.length+1, title.length)];    return  attriString;}另：label可以调用sizeToFit来调整内容适应_userLabel.text = _curUser.name;[_userLabel sizeToFit];

5:NSArray中使用firstObject和lastObject

NSArray有lastObject方法用来获取数组最后一个对象,firstObject来获取数组第一个对象,NSArray中使用firstObject和lastObject的好处在于，当数组为空时，返回nil，而不会报错。当数组为空，使用myArray[0]时，会报错。NSNumber *firstLevel = nil, *secondLevel = nil;NSArray *locationArray = [_curUser.location componentsSeparatedByString:@" "];                        if (locationArray.count == 2) {                            firstLevel = [AddressManager indexOfFirst:[locationArray firstObject]];                            secondLevel = [AddressManager indexOfSecond:[locationArray lastObject] inFirst:[locationArray firstObject]];                        }

6:日期控件ActionSheetDatePicker 多级控件ActionSheetStringPicker

小实例：                    NSDate *curDate = [NSDate dateFromString:_curUser.birthday withFormat:@"yyyy-MM-dd"];                    if (!curDate) {                        curDate = [NSDate dateFromString:@"1990-01-01" withFormat:@"yyyy-MM-dd"];                    }                    ActionSheetDatePicker *picker = [[ActionSheetDatePicker alloc] initWithTitle:nil datePickerMode:UIDatePickerModeDate selectedDate:curDate doneBlock:^(ActionSheetDatePicker *picker, NSDate *selectedDate, id origin) {                        NSString *PReValue = weakSelf.curUser.birthday;                        weakSelf.curUser.birthday = [selectedDate string_yyyy_MM_dd];                        [weakSelf.myTableView reloadData];                        [[Coding_NetAPIManager sharedManager] request_UpdateUserInfo_WithObj:weakSelf.curUser andBlock:^(id data, NSError *error) {                            if (data) {                                weakSelf.curUser = data;                            }else{                                weakSelf.curUser.birthday = preValue;                            }                            [weakSelf.myTableView reloadData];                        }];                    } cancelBlock:^(ActionSheetDatePicker *picker) {                        NSLog(@"%@", picker.description);                    } origin:self.view];                    picker.minimumDate = [[NSDate date] offsetYear:-120];                    picker.maximumDate = [NSDate date];                    [picker showActionSheetPicker];小实例：[ActionSheetStringPicker showPickerWithTitle:nil rows:@[[AddressManager firstLevelArray], [AddressManager secondLevelMap]] initialSelection:@[firstLevel, secondLevel] doneBlock:^(ActionSheetStringPicker *picker, NSArray * selectedIndex, NSArray *selectedValue) {                        NSString *preValue = weakSelf.curUser.location;                        NSString *location = [selectedValue componentsJoinedByString:@" "];                        weakSelf.curUser.location = location;                        [weakSelf.myTableView reloadData];                        [[Coding_NetAPIManager sharedManager] request_UpdateUserInfo_WithObj:weakSelf.curUser andBlock:^(id data, NSError *error) {                            if (data) {                                weakSelf.curUser = data;                            }else{                                weakSelf.curUser.location = preValue;                            }                            [weakSelf.myTableView reloadData];                        }];                    } cancelBlock:nil origin:self.view];小实例：[ActionSheetStringPicker showPickerWithTitle:nil rows:@[@[@"男", @"女", @"未知"]] initialSelection:@[_curUser.sex] doneBlock:^(ActionSheetStringPicker *picker, NSArray * selectedIndex, NSArray *selectedValue) {                        NSNumber *preValue = weakSelf.curUser.sex;                        weakSelf.curUser.sex = [selectedIndex firstObject];                        [weakSelf.myTableView reloadData];                        [[Coding_NetAPIManager sharedManager] request_UpdateUserInfo_WithObj:weakSelf.curUser andBlock:^(id data, NSError *error) {                            if (data) {                                weakSelf.curUser = data;                            }else{                                weakSelf.curUser.sex = preValue;                            }                            [weakSelf.myTableView reloadData];                        }];                    } cancelBlock:nil origin:self.view];

7:代码自动布局Masonry插件

Masonry支持哪一些属性@property (nonatomic, strong, readonly) MASConstraint *left;@property (nonatomic, strong, readonly) MASConstraint *top;@property (nonatomic, strong, readonly) MASConstraint *right;@property (nonatomic, strong, readonly) MASConstraint *bottom;@property (nonatomic, strong, readonly) MASConstraint *leading;@property (nonatomic, strong, readonly) MASConstraint *trailing;@property (nonatomic, strong, readonly) MASConstraint *width;@property (nonatomic, strong, readonly) MASConstraint *height;@property (nonatomic, strong, readonly) MASConstraint *centerX;@property (nonatomic, strong, readonly) MASConstraint *centerY;@property (nonatomic, strong, readonly) MASConstraint *baseline;小实例：        if (!_titleL) {            _titleL = [[UILabel alloc] init];            [self.contentView addSubview:_titleL];            _titleL.font = [UIFont systemFontOfSize:16];            _titleL.textColor = [UIColor blackColor];        }        if (!_valueL) {            _valueL = [[UILabel alloc] init];            _valueL.numberOfLines = 0;            [self.contentView addSubview:_valueL];            _valueL.font = [UIFont systemFontOfSize:15];            _valueL.textColor = [UIColor colorWithHexString:@"0x999999"];        }                [_titleL mas_makeConstraints:^(MASConstraintMaker *make) {            make.left.equalTo(self.contentView).offset(kPaddingLeftWidth);            make.height.mas_equalTo(20);            make.top.equalTo(self.contentView).offset(12);            make.width.mas_equalTo(kScreen_Width - 2*kPaddingLeftWidth);        }];        [_valueL mas_makeConstraints:^(MASConstraintMaker *make) {            make.top.equalTo(_titleL.mas_bottom).offset(12);            make.left.right.equalTo(_titleL);        }];
实例（注意右边跟下边要用负数）：

UIView *sv=[UIView new];

sv.backgroundColor=[UIColor redColor]；

[self.view addSubview:sv];

//定义一个剧中大小

[sv mas_makeConstraints:^(MASConstraintMaker *make) {

        make.center.equalTo(self.view);

make.size.mas_equalTo(CGSizeMake(300, 300));

}];

    UIView *childView=[UIView new];

    childView.backgroundColor=[UIColor greenColor];

[sv addSubview:childView];

//相对父视图

    [childView mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(sv.mas_left).with.offset(20);

        make.top.equalTo(sv.mas_top).with.offset(10);

make.right.equalTo(sv.mas_right).with.offset(-20);

make.height.equalTo(@200);

}];

UIView *otherChildView=[UIView new];

otherChildView.backgroundColor=[UIColor yellowColor];

[sv addSubview:otherChildView];

//相对父视图跟兄弟视图

[otherChildView mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(childView.mas_bottom).with.offset(10);

make.bottom.equalTo(sv.mas_bottom).with.offset(-10);

make.left.equalTo(sv.mas_left).with.offset(10);

make.width.mas_equalTo(@240);

}];

另一实例：

// 先给redBtn添加约束

[redBtn mas_makeConstraints:^(MASConstraintMaker *make) {

// 添加左、上边距约束

// 添加上边距约束

        make.top.mas_equalTo(100);

        // 添加左边距约束

make.left.mas_equalTo(20);

// 添加右边距约束

make.right.mas_equalTo(-20);

}];

// 还是老规矩先初始化一个btn

UIButton * blueBtn = [UIButton new];

blueBtn.backgroundColor = [UIColor blueColor];

[self.view addSubview:blueBtn];

// 给蓝色btn添加约束

[blueBtn mas_makeConstraints:^(MASConstraintMaker *make) {

             // 添加右、下边距约束

        // make.bottom.and.right.mas_equalTo(-20);

// 添加下边距约束

        make.bottom.mas_equalTo(-20);

        // 添加右边距约束

        make.right.mas_equalTo(-20);

        // 添加高度约束，让高度等于红色Btn

        make.height.equalTo(redBtn);

       // 添加上边距约束（上边距 = 红色btn的下边框 + 偏移量20）

        make.top.equalTo(redBtn.mas_bottom).offset(20);

// 添加左边距（左边距 = 父容器纵轴中心 + 偏移量0）

        make.left.equalTo(weakSelf.view.mas_centerX).offset(0);

}];

好文章：http://www.cocoachina.com/ios/20141219/10702.html

关于更新布局mas_updateConstraints的运用实例一：#import "Masonry.h"@interface ViewController5()@property(strong,nonatomic)UILabel *myLabel;@end@implementation ViewController5-(void)viewDidLoad{    [super viewDidLoad];    self.myLabel=[UILabel new];    self.myLabel.text=@"GOOD";    self.myLabel.backgroundColor=[UIColor blueColor];    [self.view addSubview:self.myLabel];        [self.myLabel mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.mas_equalTo(self.view.mas_left).with.offset(20);        make.bottom.mas_equalTo(self.view.mas_bottom).with.offset(-20);        make.size.mas_equalTo(CGSizeMake(100, 50));    }];}- (IBAction)actionBtn:(id)sender {    CGFloat newBottom=-50;    //修改布局    [_myLabel mas_updateConstraints:^(MASConstraintMaker *make) {        make.bottom.mas_equalTo(newBottom);    }];        //要进行layoutIfNeeded 才有效果    [self.myLabel layoutIfNeeded];}@end实例二：（修改键盘跟输入框的隐藏问题）#import "Masonry.h"@interface ViewController4 ()@property (strong, nonatomic) UITextField *textField;@end@implementation ViewController4- (void)dealloc {        [[NSNotificationCenter defaultCenter] removeObserver:self];}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.        __weak typeof(self) weakSelf = self;        _textField = [UITextField new];    _textField.backgroundColor = [UIColor redColor];    [self.view addSubview:_textField];        [_textField mas_makeConstraints:^(MASConstraintMaker *make) {                make.left.mas_equalTo(10);        make.centerX.equalTo(weakSelf.view);        make.bottom.mas_equalTo(0);        make.height.mas_equalTo(40);    }];        // 注册键盘通知    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrameNotification:) name:UIKeyboardWillChangeFrameNotification object:nil];    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHideNotification:) name:UIKeyboardWillHideNotification object:nil];}- (void)keyboardWillChangeFrameNotification:(NSNotification *)notification {        // 获取键盘基本信息（动画时长与键盘高度）    NSDictionary *userInfo = [notification userInfo];    CGRect rect = [userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];    CGFloat keyboardHeight = CGRectGetHeight(rect);    CGFloat keyboardDuration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];        // 修改下边距约束    [_textField mas_updateConstraints:^(MASConstraintMaker *make) {                make.bottom.mas_equalTo(-keyboardHeight);    }];        // 更新约束    [UIView animateWithDuration:keyboardDuration animations:^{                [self.view layoutIfNeeded];    }];}- (void)keyboardWillHideNotification:(NSNotification *)notification {        // 获得键盘动画时长    NSDictionary *userInfo = [notification userInfo];    CGFloat keyboardDuration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];        // 修改为以前的约束（距下边距0）    [_textField mas_updateConstraints:^(MASConstraintMaker *make) {                make.bottom.mas_equalTo(0);    }];        // 更新约束    [UIView animateWithDuration:keyboardDuration animations:^{                [self.view layoutIfNeeded];    }];}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {        [super touchesBegan:touches withEvent:event];    [self.view endEditing:YES];}@end