加载UI

weak情况

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@property (weak,nonatomic) UILabel *nameLabel;   UILabel *nameLabel = [[UILabel alloc] init]; self.nameLabel = nameLabel;

strong情况

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@property (strong,nonatomic) UILabel *timeLabel;   - (UILabel *)timeLabel {     if (!_timeLabel) {         _timeLabel = [[UILabel alloc] init];     }     return _timeLabel; }