IOS客户端Coding项目记录(四)

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);
        }];

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