07選取器總結

選取器載入映像時要封裝成UIImageView
UIPickerViewDataSource,UIPickerViewDelegate
 -(NSInteger)numberOfComponentsInPickerView:(UIPickerView* )pickerView;
 -(NSInteger)pickerView:(UIPickerView*)pickerView numberOfRowsInComponent:(NSInteger)component;
 

(required)選取器中的元素
//字串  -(NSString*)pickerView:(UIPickerView*)pickerView
   titleForRow:(NSInteger)row
   forComponent:(NSInteger)component;

//映像    -(UIView*)pickerView:(UIPickerView*)pickerView
   viewForRow:(NSInteger)row
   forComponent:(NSInteger)component;
當選取器有兩個組件（即有兩個框）且右邊框的內容隨左邊框的內容變換而變換時，實現
 -(void)pickerView:(UIPickerView*)pickerView
  didSelectRow:(NSInteger)row
  inComponent:(NSInteger)component;
如果要調整兩個組件的大小則
-(CGFloat)pickerView:(UIPickerView*)pickerView widthForComponent:(NSInteger)component;

注意：IB中需配置pickerView的attribute 中的dataSource與Delegate都連向File's Owner

UIPickerView 方法：-(NSInteger)selectedRowInComponent:(int);
尋找路徑並載入
NSBundle *bundle=[NSBundle mainBundle];
NSString *path=[bundle pathForResource:@"檔案名稱" ofType:@"副檔名"];
NSDictionary *d=[[NSDictionary alloc]initWithContentsOfFile:path];

排序數組
NSArray *array;
NSArray *sorted=[array sortedArrayUsingSelector:@selector(compare:)];

得到字典的全部鍵
NSArray *arr=[dictionary allKeys];

選擇選取器的特定組件特定行並實現動畫
[picker selectedRow:row inComponent:component animated:YES];
[picker reloadComponent:component];

映像匯入
UIImage *image=[UIImage imageName:@"全部檔案名稱"];
UIImageView *imageView=[[UIImageView alloc]initWithName:image];

索引值對
[self setValue:NSObject* forKey:@"..."];

隨機數產生
int i=random()%n;

視頻音頻匯入
#import<AudioToolbox/AudioToobox.h>
第一：記得加入framework
NSString *path=[[NSBundle mainBundle]pathForResource:@"檔案名稱" ofType:@"副檔名"];
SystemSoundID soundID;
AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileWithPath:path],&soundID);
AudioServicesPlaySystemSound(soundID);

自訂調用方法函數
[self performSelector:@selector(函數名) withObject:nil afterDelay:時間];