问题
array of images added into Project
imaging is the UIImageView and imagg is Image choosen by user its default
_imaging.image=imagg;
arr = [NSArray arrayWithObjects:
[UIImage imageNamed:@"1.jpg"],
[UIImage imageNamed:@"2.jpeg"],
[UIImage imageNamed:@"3.jpeg"],
[UIImage imageNamed:@"4.jpeg"],
[UIImage imageNamed:@"5.jpeg"],
nil];
assume user selected third image i.e 3.jpeg i am showing the 3.jpeg in imageview. Then using two button actions respectively Next and Previous next or previous images 3.jpeg should display.
- (IBAction)previous:(id)sender {
////
}
- (IBAction)next:(id)sender {
//////
}
}
for the next action its starting from 2nd image even for previous action its starting from 1st image.
回答1:
this is the simple concept, this is working in static method, but working fine
assign the one global variable
@property (strong,nonatomic) NSString *imagestr;
- (IBAction)previous:(id)sender {
int str=[imagestr integerValue];
NSLog(@"the int value==%d",str);
switch (str) {
case 0:
_imaging.image=[arr objectAtIndex:4];
imagestr=@"4";
break;
case 1:
_imaging.image=[arr objectAtIndex:0];
imagestr=@"0";
break;
case 2:
_imaging.image=[arr objectAtIndex:1];
imagestr=@"1";
break;
case 3:
_imaging.image=[arr objectAtIndex:2];
imagestr=@"2";
break;
case 4:
_imaging.image=[arr objectAtIndex:3];
imagestr=@"3";
break;
default:
break;
}
}
- (IBAction)next:(id)sender {
int str=[imagestr integerValue];
NSLog(@"the int value==%d",str);
switch (str) {
case 0:
_imaging.image=[arr objectAtIndex:1];
imagestr=@"1";
break;
case 1:
_imaging.image=[arr objectAtIndex:2];
imagestr=@"2";
break;
case 2:
_imaging.image=[arr objectAtIndex:3];
imagestr=@"3";
break;
case 3:
_imaging.image=[arr objectAtIndex:4];
imagestr=@"4";
break;
case 4:
_imaging.image=[arr objectAtIndex:0];
imagestr=@"0";
break;
default:
break;
}
}
回答2:
On clicked on next button
Before using this first set currentIndex in this
-(IBAction)next{
if (arr.count > 0) {
currentIndex++;
if (currentIndex > arr.count - 1) {
currentIndex = 0;
}
imageViewObj.image = [arr objectAtIndex:currentIndex];
}
}
on pervious button
-(IBAction)pervious{
if (arr.count > 0) {
currentIndex--;
if (currentIndex <= 0) {
currentIndex = arr.count - 1;
}
imageViewObj.image = [arr objectAtIndex:currentIndex];
}
}
Try this is working fine
回答3:
- Set some integer property currentIndex to 2 (if you load first the 3rd image).
- When calling the next/previous methods increment/decrement that property and load the correct image.
ImageView *image = [arr objectAtIndex:currentIndex]
回答4:
when you initialize your view controller, keep track of the current image being viewed for example 0, to be used as an array index.
When next is pressed, increment the index and retrieve the image from the array using the updated count.
e.g.
- (IBAction)next:(id)sender {
imageCount++;
[myImageView setImage:[UIImage imageNamed:arr[imageCount] ];
}
hope this helps. :)
来源：https://stackoverflow.com/questions/24864821/display-array-of-images-in-uiimageview