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
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