折磨人的两个小问题[IOS]

来源：互联网发布：小志网络赚钱博客编辑：程序博客网时间：2024/05/01 20:17

NO.1

int i =2;

NSLog(@"Selected index:%@",i);

结果：Selected index（null）或者直接crash

解决方法：NSLog(@"Selectedindex:%i",i);

NO.2

cellForRowAtIndexPath中

for (UIButton *viewinsubviews) {

[view addTarget:selfaction:@selector(filterSelected:)

forControlEvents:UIControlEventTouchUpInside];

}

-(IBAction)filterSelected:(id)sender

{

}

结果:sender为空（0x0)

原因:view已经被销毁

解决方法：view设成property

补充（NO.2)：

CGRect frame =CGRectMake(i*62,line*62,52,52);

UIButton *btn = [[UIButtonalloc] initWithFrame:frame];

[btnsetBackgroundColor:[UIColorcolorWithPatternImage:[UIImage imageNamed:@"Movie_detail_button_episode_number.png"]]];

[btnaddTarget:self action:@selector(onEpisodeSelected:)forControlEvents:UIControlEventTouchUpInside];

[btn setTitle:[NSString stringWithFormat:@"%d",line*numperLine +i] forState:UIControlStateNormal];

这又是正常的

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