懒加载

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        //添加子控件
        [self.contentView addSubview:self.avaterView];
        [self.contentView addSubview:self.nameLabel];
        [self.contentView addSubview:self.phoneLabel];
        [self.contentView addSubview:self.callBtn];
    }
    return self;
}


#pragma mark - 懒加载,重写getter方法
//布局子控件

- (UIImageView *)avaterView {
    if (!_avaterView) {
        self.avaterView = [[[UIImageView alloc] initWithFrame:CGRectMake(20, 5, 40, 40)] autorelease];
        self.avaterView.layer.cornerRadius = 5;　　//设置圆角
        self.avaterView.layer.masksToBounds = YES;  //将超出部分裁剪掉.(默认不会裁掉,因此圆角效果不会出现)
    }
    return [[_avaterView retain] autorelease];　　//安全处理
}

- (UILabel *)nameLabel {
    if (!_nameLabel) {
        self.nameLabel = [[[UILabel alloc] initWithFrame:CGRectMake(70, 5, 80, 40)] autorelease];
        self.nameLabel.textColor = [UIColor blackColor];
    }
    return [[_nameLabel retain] autorelease];
}

- (UILabel *)phoneLabel {
    if (!_phoneLabel) {
        self.phoneLabel = [[[UILabel alloc] initWithFrame:CGRectMake(170, 5, 150, 40)] autorelease];
        self.phoneLabel.textColor = [UIColor grayColor];
    }
    return [[_phoneLabel retain] autorelease];
}

- (UIButton *)callBtn {
    if (!_callBtn) {
        self.callBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        self.callBtn.frame = CGRectMake(330, 5, 40, 40);
        [self.callBtn addTarget:self action:@selector(handleCall:) forControlEvents:UIControlEventTouchUpInside];
        [_callBtn setImage:[UIImage imageNamed:@"action_call"] forState:UIControlStateNormal];
    }
    return [[_callBtn retain] autorelease];
}